Bumblebee met Optimus Prime when he was delivering a message to him. Though he was unfamiliar with the Autobot's physical appearance, Bumblebee still took on the mission and soon enough, told Optimus that Sentinel Zeta Prime had died at the hands of the Decepticons. He then accompanied the Autobot leader and Ratchet as the three faced off against Starscream. Shortly after, he and Optimus went alongside Sideswipe to purposely get captured. The two teamed up for the final time during Megatron's uprising to fight against Trypticon, alongside Ironhide. The two later were together during the launching of Autobots during the evacuation of the masses of Cybertron. As the war waged on, Bumblebee saw no point in continuing. As he believed Megatron had defeated the Autobots and the group had already lost. However, Optimus encouraged him to try and continue to fight.
After Cybertron's end, Bumblebee accompanied Optimus to Earth. He was one of the few to do so and soon enough, fought by his side in the Autobots' battle to destroy the evil forces of the Decepticons. Bumblebee took part in a mission alongside Optimus to fight against Skyquake. Optimus proved his compassion for Bumblebee as he carefully looked after him and later complimented his tactics after the battle. After Optimus fell victim to Cybonic plague, Bumblebee went onto the Nemesis and risked his own life to retrieve a cure. After Optimus was cured, he stopped everyone from applauding him and told them to instead clap for both Bumblebee and Ratchet. The two later went to investigate a GroundBridge incident, which triggered their human allies to be trapped in an alternate dimension. During Arcee and Bulkhead's fights against Airachnid, Breakdown, Megatron and Starscream, Bumblebee embarked with Optimus on a mission of their own. When Optimus fell into a struggle during his battle with Unicron, Bumblebee ignored his orders to stay behind and came to his aid alongside Bulkhead and Arcee. He fought alongside him when he defeated Unicron and was saddened when an amnesia-like Optimus turned Orion Pax did not remember him and instead left with Megatron, under the thought of him still being good.
Bumblebee and the other Autobots went to save him and succeeded, welcoming him as he arrived back at the base. Optimus showed major concern for Bumblebee when his T-Cog was stolen by MECH. Optimus told him to not embark on any missions with the rest of the Autobots until it was repaired. He went with Optimus to stop a fight between Wheeljack and Dreadwing, which Fowler had desperately been trying to cover up. He accompanied Optimus underground to confront Megatron, whom had been worn out after defeating an Insecticon. He stood by Optimus' side as several Vehicons and Dreadwing surrounded them. Bumblebee and Optimus went to fight off against Insecticons, under the command of Airachnid. Bumblebee went with Optimus to investigate a possible Autobot life signal and soon enough, the two met Smokescreen together. The two were saved by the latter during a battle against Starscream, whom had used the Apex Armor to give himself a strength boost.
He accompanied Optimus to rescue Smokescreen from Soundwave, but failed. Optimus and Bumblebee went with the other Autobots to save Cybertron. However, they failed and returned to base, where they fended off several Vehicons before Bumblebee and the other Autobots GroundBridged away. Eventually, Bumblebee reunited with the other Autobots and human friends with Ultra Magnus as acting leader while Optimus was gone along with Smokescreen. However, Optimus Prime returned to the Autobots in a new body, thanks to Smokescreen reviving Optimus with the Forge of Solus Prime. After a while of hunting for Predacon bones, Bumblebee and Optimus rarely hang out. In Minus One, Bumblebee accompanied Optimus to Antarctica with Arcee, Ultra Magnus and Wheeljack to secure a device that the Decepticons were planning to steal. They failed to secure the device and returned to Optimus when he was finished fighting Predaking. Optimus placed his left hand on Bumblebee's right shoulder while Arcee called back to base for a Groundbridge. When the team discovered that Ratchet was taken by the Decepitcon, they devised a plan to get him back. Later on, Ratchet was able to contact their base and told them about Megatron's plan. The team quickly prepared to attack the Decepticons in their final battle. During their battle, Bumblebee and Arcee were left to fend off Starscream and his small armada. They defeated some of them and when Smokescreen dropped the Star Saber, Bumblebee knocked Shockwave to the ground before grabbing the sword. As Bumblebee ran downwards to Optimus to give him the Star Saber, Megatron shot several times at him which killed Bumblbee instantly as he fell in the Omega Lock. He was revived by the Cybermatter in the Omega Lock and killed Megatron with the Star Saber. As Megatron's lifeless husk fell to Earth, Bumblebee helped Optimus, who was hanging from the Omega Lock. As the team restored Cybertron and said goodbye to their fellow human friends, they went back home.
In Predacons Rising, Optimus held a little ceremony to promote Bumblebee from scout to Warrior. After this, Optimus went with Wheeljack to retrieve the AllSpark from deep space. While they were gone, Bumblebee was temporarily in charge after Ultra Magnus was horribly injured by a Skylynx. Bumblebee tried contacting Optimus after he and the others were attacked by Unicron, who was inside Megatron's body. Optimus and Wheeljack did recieve his call, but couldn't reply back because of communication issues. In the end, Optimus defeated Unicron and trapped his evil essence in the AllSpark's container. Before Optimus sacrificed himself to fully restore Cybertron, he told his team to keep fighting the noblest of fights. Bumblebee promised Optimus that they will keep the peace and as they sadly watch Optimus go in the Well of AllSparks, millions of Spark rose from the Well. One red spark, presumably Optimus's spark shines out.
Optimus and Bumblebee remain close friends. They have a history together during the war on Cybertron and on Earth. Optimus treats Bumblebee like a son, much like Optimus does with Smokescreen. They continued their relationship in Transformers: Robots in Disguise where Optimus acted like Bumblebee's guide in spirit and led him to Earth.
Bumblebee met Arcee somewhere between the fall of Cybertron and Arcee's arrival to Earth with Cliffjumper. Over their years as teammates on Earth, the two became friends, with Arcee once referring to Bumblebee as family. The two fought alongside each other frequently. Bumblebee looks up to Arcee, like a younger sibling to older sibling. When Bumblebee changed his paint job, Arcee liked his new style and said if she if she reversed her colors she would be pink. Bumblebee and Arcee went along on two relic missions in season 2. When Bumblebee killed Megatron and got his voice back, Arcee was surprised to hear his voice.
Before battling Unicron's army, Arcee passes the chance as she tells Bumblebee that he has proved his metal. Bumblebee replied and said that it didn't hurt to watch from the best, which he was talking about Arcee being a powerful little two wheeler and a true warrior. This might apply that they may have some affection for each other but their relationship can be considered like a sibling relationship or from what fans have speculated, their relationship can be speculated as just close friends
Bumblebee and Bulkhead became friends during their battles on Earth. Bulkhead arrived to aid him and Arcee during a intense fight with two Vehicons. He later accompanied Bulkhead and Arcee on the Nemesis to rescue William Fowler from Starscream. Bumblebee went with Bulkhead and the other Autobots into space to combat Megatron and the other Decepticons. Later, the two investigated the arctic together and went back to the Autobot base together. However, the two soon enough found themselves victim to Scraplets attacks and with the help of Ratchet, were able to drive them off. He rode with Bulkhead and the others to transport the Dynamic Nuclear Generation System and fought by his side against Vehicons. Bulkhead went with Bumblebee, Optimus and Arcee to prevent the theft of the Energon Harvester at the hands of Decepticons Knock Out and Breakdown. However, their attempt proved unsuccessful and the Decepticons took it. Luckily, Bulkhead was able to destroy the device and Bumblebee came to his aid after he was too worn out to continue fighting.
Bulkhead is like a brother to Bumblebeee.
Bumblebee first met Ratchet when he was largely damaged and was stabilized by him although Ratchet could not restore his voice. Ratchet held guilt and whenever he looked at Bumblebee was reminded his work wasn't good enough. Ratchet was glad when he able to repair Bumblebee's T-Cog. When Bumblebee's voice was restored by the Cybermatter, which existed thanks to Ratchet, Bumblebee gave Ratchet a big hug. Optimus noted that Ratchet's work had come through for Bumblebee.
Like Optimus and Ultra Magnus, Ratchet is like an adult figure and family member to Bumblebee.
Despite their similar ages and personalities, Bumblebee and Smokescreen do not interact as much. Like the others, Bumblebee thought Smokescreen was a hand made trap for Optimus when he first arrived, before Smokescreen saved his life. The two seem to have a brother to brother relationship as they help each other, but they do annoy each other often like twins. They respect and care for each other like family members.
From the first time they met, Bumblebee and Raf is shown to have a very close bond with each other. Raf was the only human that could understand Bumblebee and seemed to share his passion for racing. They both became best friends and Bee became Raf's Autobot guardian. When Bumblebee was taken over by Megatron, his own influence refused Megatron to hurt Raf (though Ratchet was still punched many times). In One Shall Fall, Bumblebee was hurt as Raf was injured by Megatron and opted to shoot Megatron himself but was restrained by Bulkhead from doing so. Bumblebee sacrificed some of his Energon for Ratchet to cure Rafael, which worked successfully as Rafael woke up. In One Shall Rise, Part 1, Bumblebee saved Raf and June's lives from a tornado, which they were both thankful for. When the Decepticons took the children captive for the Omega Keys, Bumblebee gave his up for Raf. When he, Raf and Ratchet were hiding at the Harbinger, they saw a ship coming, Bumblebee told Raf to stay back until they knew whether or not it was friendly. Raf was filled with joy when Bumblebee had his voice back and was truly sad when Bee said his goodbyes before he left to Cybertron.
Jack and Bumblebee rarely hang out, but they are good friends. Bumblebee instantly jumped at a chance to go street racing with Jack and tried to convince Raf to let him do it "just this once". They remain good friends.
Bumblebee rarely interacts with Miko. In Operation: Bumblebee, Part 1, Miko tried to make Bumblebee feel better when he lost his T-cog by suggesting they watch TV. However, a commercial of a car made things a lot worse for Bumblebee. In Toxicity, Bulkhead told Bee to look after Miko when they were leaving to New York. Miko is one of his good human friends.
In Pilot (Part 1), Bumblebee began to have visions of Optimus. These vision led Bumblebee to go to Earth, along with Strongarm and Sideswipe who followed Bee. In Pilot (Part 2), Bumblebee and his team, comprised of Sideswipe, Strongarm, Fixit, Grimlock, Russell Clay, and Denny Clay, saw Optimus Prime appear to take out Underbite and save Denny. Much to Bee's surprise, he asked Optimus if he was alive and Optimus replied by stating he is not certain. Optimus complimented Bumblebee and his team and told them they will face danger on Earth but he believes they can accomplish great things. Optimus told Bumblebee he is ready to lead and to not doubt himself. Bee asked Optimus if he would see him again, though Optimus did not know what the universe has in store for him. Optimus tells Bee he will prevail before disappearing from their sight. In W.W.O.D.?, Bumblebee had another vision of Optimus who told Bumblebee that he was only to make contact with Bee if the Primes see it was dire problem. Optimus hoped Bumblebee was making progress but Bee told him that he was not doing a good job no matter how much he tried to be like Optimus. Optimus explained to Bee that he is not him but before he could explain more to Bee, Optimus disappeared from Bee's sight. In Battlegrounds, Part 2, Bumblebee and his team helped Optimus (who was reborn) fight Megatronus. Though after a lengthy battle with the first Decepticon and Steeljaw's pack, the Autobots emerged victorious. At the scrapyard, Optimus tells Bumblebee he has become a great leader and is convinced by Bee to stay on his team but as an equal than leader.
Optimus and Bumblebee have talked about their conflict in leading the Autobots as revealed in Decepticon Island (Part 1). Their leadership problem has slightly impacted their bond as it continued to nearly place the Autobots in danger against Steeljaw's new Decepticon empire. As the pair headed towards the ventilation hub with Toolbox, Bumblebee talks with Optimus and manages to persuade Optimus in letting him lead. During the fight against Steeljaw (who was overpowered with a combined Decepticon Hunter), Optimus blocked Steeljaw from attacking Bumblebee as Bee was detonating the stasis bomb and Optimus stated he has Bee's back. The pair along with Fixit, Toolbox, and the other Mini-Cons managed to defeat Steeljaw and they all made it out safe as the stasis bomb detonated over the Decepticons. In the aftermath, Bumblebee and Optimus reconciled as Optimus reminded Bee that he will be there to assist him no matter what. He also reminds Bee to never doubt himself as they shook hands.
Optimus and Bumblebee remain close friends. Optimus is a mentor and father-figure to Bumblebee. They have a history together during the war on Cybertron and on Earth. They continued their relationship from Transformers: Prime to Transformers: Robots in Disguise.
Bumblebee met Russell in Pilot (Part 1) where he was not surprised that Sideswipe already revealed himself to Russell. In some cases, Bumblebee would help or prevent Russell out of dangerous situations. While Russell is no Raf, Bumblebee seems to keep a meaningful and caring friendship with Russell.
Bumblebee met Denny Clay in Pilot (Part 2). While they rarely interact, Bumblebee and Denny are both adult figures. Denny would often let Bee take whatever he needs in the scrapyard and Bumblebee would work well with Denny on certain missions or tasks.
Denny Clay and Bumblebee both have respect, care and friendship in their bond. They are like Optimus Prime and Cade Yeager in Transformers: Age of Extinction.
In Pilot (Part 1), Bumblebee and his partner Strongarm were on street patrol to go after Sideswipe. However, Bumblebee had visions of Optimus Prime which eventually led him, Strongarm, and Sideswipe to Earth. When Bee freed Sideswipe and Strongarm from their cuffs, Sideswipe left while Bumblebee and Strongarm walked to meet up with Fixit. In Pilot (Part 2), Grimlock joined up with the team to stop Underbite. In Collect 'Em All, Bumblebee talked with Strongarm about being homesick and gave her some advice about staying on Earth. Later, Bumblebee complimented Strongarm for breaking protcol to help the team bring Filtch in. In Rumble in the Jungle, Strongarm was annoyed that Bumblebee was following her on her first solo mission. Bumblebee desired to be an observer and she went along with it. It soon reached to a point where Strongarm lied to Fixit about capturing Springload to avoid having the rest of the team on her first solo mission. When Bumblebee learned about this from Strongarm after her hand was burned by touching Springload and escaping from a collapsing room, Bumblebee was disappointed in Strongarm but opted to let her prover herself. When she wanted his help, Bumblebee was honored to. They were successful in capturing Springload and Bumblebee complimented Strongarm as he placed his hand on her shoulder as he tells her how good she did on her first solo mission. In the ending of Battlegrounds, Part 2, Strongarm opted to remain along with her superior officer and the rest of Bee's team. In Decepticon Island (Part 1), Strongarm noticed the struggle of leadership between Optimus and Bumblebee as she advised Bumblebee to talk with Optimus. In the ending of Decepticon Island (Part 2), Strongarm officially remains with Bumblebee and his team.
Strongarm seems to worship Bumblebee as a hero and role model, much like Smokescreen did for Optimus. She respects, cares, would provide cover, and honors Bumblebee. She would refer to Bee as "Sir" or "Lieutenant". Since Strongarm is considered a teenager among Cybertronian standards, she is like a daughter to Bumblebee.
Bumblebee met Grimlock in Pilot (Part 2) where he saw Grimlock as another escaped Decepticon next to Underbite. After the team captured Underbite, Bee placed Grimlock on probation. In Trust Exercises, Bumblebee and Grimlock preformed their trust exercise test, which proved successful but Sideswipe and Strongarm laughed when they saw Grimlock carrying Bumblebee. Bumblebee took Grimlock to capture Hammerstrike but failed to capture him when Grimlock was stuck on the bottom of the sea. Bumblebee explained to Grimlock that they are steps to winning a race. They worked as a team and they were able to capture Hammerstrike. In W.W.O.D.?, Grimlock laughed along with Sideswipe and Strongarm when Bumblebee tried to act like Optimus Prime. When the team captured Terrashock, Grimlock questioned Bumblebee about what would cowboys do after a successful mission and Bumblebee replied by stating they would ride off into the sunset, which the team did in the end. In Collect 'Em All, Bumblebee aided Grimlock in lifting up a near collapsing bridge with a pillar. In True Colors, Bumblebee could not believe Grimlock began attacking the team. It was revealed that Minitron was controlling Grimlock the whole time and Grimlock managed to defeat him. Bumblebee told Grimlock that he was officially an Autobot and that Fixit will change his Decepticon symbols to Autobot symbols, which Grimlock was excited and stood proudly to thank Bee. In Adventures in Bumblebee-Sitting!, Grimlock was the first one to get pranked by Bumblebee, who's maturity levels went down after an attack by Quillfire. Grimlock wiped his face from the oil pie that Bee threw at his face and stated it was mean. Grimlock and Strongarm had to watch Bumblebee when he showed up with them to an amusement park near Crown City. Despite not agreeing to it, Grimlock was forced to give Bumblebee a ride in his dino mode while Bee rode on his back, like a cowboy on a horse. In Deep Trouble, Bumblebee patted Grimlock on the side that Grimlock was hit on during the obstacle course, which Grimlock kept as a secret from the team. It was not until Bumblebee and Grimlock were trapped in a room with nano-drones. After the drones were destroyed when Grimlock deactivated them with a console, Bumblebee discovered Grimlock's injury and realizes Grimlock was hiding it all along. Grimlock told Bee that he did not want to let the team down and that is why he kept his injury a secret. Bumblebee apologized to Grimlock by stating he did not mean to put pressure on Grimlock and that he should tell the team about these kind of incidents. Grimlock told Bee to leave him there but Bee helped his friend get on his feet. Bumblebee and Grimlock worked together in taking out Octopunch. In the ending of Battlegrounds, Part 2, Grimlock decided to stay on Bee's team. In the ending of Decepticon Island (Part 2), Grimlock officially decides to stay with Bumblebee and the rest of the team.
Grimlock looks up to Bee as a true leader and ally to have.
Bumblebee and Strongarm were chasing Sideswipe in Pilot (Part 1). In Pilot (Part 2), Sideswipe decided to stay on Earth with Bumblebee, Strongarm, Fixit, Grimlock, Denny, and Russell. Sideswipe's loyalty to the team was questioned in As the Kospego Commands! where Sideswipe had left Grimlock to be attacked by Thunderhoof after being ordered by Bumblebee to stay with Grimlock to guard the generator from Thunderhoof. Sideswipe managed to regain trust with Bumblebee after he tried to deceive Thunderhoof and they fist bumped each other after sending Thunderhoof inside the black hole portal. Sideswipe takes under Bumblebee's command and repects his leadership. In the ending of Battlegrounds, Part 2, Sideswipe decided to stay on Bumblebee's team. In Portals, Bumblebee remarked Sideswipe as a "crazy cousin" as he stated his team are like a family. In the ending of Decepticon Island (Part 2), Sideswipe officially decides to stick with Bumblebee and the rest of the team.
Bumblebee has sort of a "father" to "son-in-law" relationship with Sideswipe, which they both care and look out for each other as team members and friends.
Bumblebee and Fixit have a respectable and cooperative bond. When they first met, Bumblebee realized something was wrong with Fixit's systems and when Denny tried to help repair Fixit in The Trouble with Fixit, Fixit was reverted back to his original protocol mode as an equipped Mini-Con guard, which later resulted in Fixit being deactivated by Denny and repaired to his "normal state". Bumblebee would often comm Fixit during missions about certain escape Decepticon prisoners or other related problems that Fixit could assist him with. In Decepticon Island (Part 2), Fixit and his fellow freed Mini-Cons all helped Bumblebee and Optimus in defeating Steeljaw and escaped the ship before the stasis bomb could explode. In the aftermath, Fixit officially remains with Bumblebee and the rest of the team.
Fixit seems to look up to Bumblebee the most as a respectable leader and friend.
Bumblebee reunited with Jazz when the latter made his way into the scrapyard one night. They talked about recent events and Jazz opted to take Bee with his team back to Cybertron to clear things up with the Council but the team realized they still had a mission on Earth. After Ped was captured, Bumblebee gave Jazz goodbye handshakes and wished him safe travels before the latter left to Cybertron to clear everything up with the Council.
Bumblebee helped Drift with fighting Fracture and Drift offered to repay his life debt to Bumblebee. At first, Bumblebee seemed to not require Drift's protection but he did take Drift and his Mini-Cons to the scrapyard. Bumblebee and his team along with Drift's Mini-Cons helped Drift with fighting Fracture and his Mini-Cons in the scrapyard until Fracture escaped with his Mini-Cons. Bumblebee also prevented Fracture from detonating his own ship with Drift's Mini-Cons with it, which saved their lives. When Drift and his Mini-Cons came to Earth again, they opted to remain with Bumblebee's team after recapturing Springload and Quillfire, as Drift stated he and his students want to learn more. In the ending of Battlegrounds, Part 2, Drift and his students remain with Bumblebee's team. In Decepticon Island (Part 2), Drift and his students officially remain with Bumblebee's team.
Drift respects Bumblebee as a leader and takes interest in learning from him. Since they both share the same kind of authority and are adults, they have a trustworthy and understanding friendship.
While Jetstorm and Slipstream are rarely seen to interact with Bumblebee, they look up to him like a mentor.
Windblade complimented Bumblebee's team and leadership when she was brought to the scrapyard by Sideswipe. Before leaving the scrapyard to capture Zizza, Windblade stated a battle cry that left an impression on Bumblebee, which the latter asked Windblade on how she came up with it so fast since he would have the worst time. They both remain good friends and teammates. In Battlegrounds, Part 2, Windblade decided to remain on Bumblebee's team.
Of all the Decepticons, Bumblebee had a personal feud with Megatron due to him crushing his voice box. Megatron himself regrets not killing Bumblebee as the scout robbed him of the Spark Extractor. Bumblebee later got revenge when he ended the war by killing Megatron with the Star Saber. For the first time in the series, Bumblebee's voice box was repaired by the Cybermatter. When Bumblebee stabbed Megatron with the Star Saber, speaking in his real voice, he told Megatron that he will never rob anyone of anything ever again. Megtron's lifeless body fell off the Omega Lock and down towards Earth. In Predacons Rising, after Megatron was resurrected by Unicron and freed from Unicron, Megatron abandoned the Decepticons. Bumblebee showed no signs of hatred towards Megatron.
Starscream is one of Bumblebee's main enemies. Starscream would taunt Bumblebee at any moment that they face off. Bumblebee would fight Starscream no matter how the odds are. In Operation: Bumblebee, Part 2, Bumblebee fought Starscream but Starscream blasted his T-cog, which Ratchet was able to repair. In Predacons Rising, Bumblebee lied to Starscream about the Immobilizer and tricked him so that Knock Out was able to knock Starscream unconscious.
Bumblebee rarely sees Soundwave. Bumblebee traded his omega key with Soundwave in exchange for Rafael in Darkest Hour. In Minus One, Bee was surprised like the other Autobots when Soundwave was captured and when he spoked during his interrogation.
Bumblebee seems to have developed a rivalry with Decepticon Knock Out. Their rivalry was not noticeable when the two first met, but became abundantly clear between the time Bumblebee went with Jack to compete in races or when Bumblebee's T-Cog was stolen by MECH. In both instances, Bumblebee was taunted by Knock Out, either for not being as fast as him. Bumblebee fought Knock Out several occasions. During a relic hunt with Arcee in New York, Bumblebee fought Knock Out to get the Phase Shifter. During a hunt for the Omega Key, Knock Out used the resonance blaster against Bumblebee and Arcee. In Predacons Rising, Knock Out somewhat helped Bumblebee by providing information on the escape Decepticons. Later, Knock Out revealed that he wanted to join the Autobots and Bumblebee was disappointed that Knock Out destroyed the immobilizer. Bumblebee and Knock Out became allies after that.
Bumblebee fought Airachnid in Partners where he got the upper hand in defeating her. She is one of his enemies.
Bumblebee received a report from Sideswipe and Strongarm about Steeljaw in Trust Exercises where Bee puts Steeljaw on the top of their most wanted Decepticons. Bumblebee met and fought Steeljaw in True Colors but Steeljaw managed to escape while taking Underbite in his stasis pod. In Sideways, Steeljaw fought and got the best of Bumblebee in a short fight. Steeljaw knocked Bee unconscious then threw the Autobot in a trash compactor, almost crushing him until Sideswipe stopped the trash compactor. Bumblebee fought Steeljaw and knocked the Decepticon unconscious with his weapon. Steeljaw managed to escape from his cuffs and made a diversion by unmooring a garbage barge from a docks and freeing the other Decepticons while the Autobots were busy trying to stop a collision from the two boats. When the Autobots regained control of the scrapyard from Steeljaw's pack, Bumblebee attacked Steeljaw as he jumped on him and tackled him to the ground where they fought. When the stasis pods were closed by Denny, Steeljaw promised to give the Decepticons Earth as their new home with him as their leader. Bumblebee and his team chased Steeljaw and his pack out of the scrapyard. In Misdirection, Bumblebee was involved in a trick set by Steeljaw as Steeljaw injured himself on purpose to be placed in stasis pod so he could escape from and free some of the Decepticon prisoners. Ever since then, Bumblebee has been on a hot pursuit to catch Steeljaw as shown in Bumblebee's Night Off. In Decepticon Island (Part 2), Bumblebee and Optimus struggled to fight Steeljaw, who was overpower with combined Decepticon Hunters. However, with Fixit and the rest of the Mini-Cons aid, Bumblebee and Optimus defeated Steeljaw as Bumblebee regained his Decepticon Hunter then used it to trap Steeljaw in the floor. Steeljaw remained trapped in the floor as the Autobots escaped. He promised it wasn't over and vowed to tear Bumblebee apart.
Steeljaw is one of Bumblebee's main enemies and they have a hero to villain relationship similar to Optimus Prime and Megatron.
Bumblebee tangled with Underbite in Pilot (Part 1). Bumblebee and his new team made a plan in stopping Underbite from reaching Crown City. Their plan almost failed when Bumblebee and Strongarm's weapons failed to secure Underbite. As Bee, Strongarm, Grimlock, Denny Clay blocked the bridge to Crown City, Sideswipe and Russell arrived to lead Underbite to the quarry with some bait. Near the edge of the quarry, Underbite was about to fall in as Bumblebee, Strongarm, Grimlock, Denny and Sideswipe push Underbite in the quarry. However, Underbite ate the bait and overpowered the team. Bumblebee was about to stop Underbite from crushing Denny Clay in his truck until Optimus Prime appeared and threw Underbite in the quarry and saved Denny. In Battlegrounds, Part 2, Bumblebee was thrown in the air and used it for Grimlock to position Underbite into being hit by Bumblebee.
Bumblebee and Sideswipe stopped Thunderhoof from using a space bridge to go to Cybertron. In Battlegrounds, Part 1, Bumblebee was prevented by Thunderhoof from interfering with the construction of the arch.
Fracture came to Earth to collect the bounty on Bumblebee but was enraged when Drift took it himself but did not turn Bumblebee in and was defeated by Bumblebee and his team.
Bumblebee fought and captured Bisk with his team in More than Meets the Eye. In Bumblebee's Night Off, Bumblebee faced off Bisk and his Mini-Cons during a Rear Axle concert as the Rumbledome. Though Bisk seemed to have the upperhand, Bumblebee defeats and captures him along with his Mini-Cons.