Ratbat was once the Mini-Con representative for the High Council in the days before the great war, and was well known for being corrupt and in the pocket of the wealthy elite. The general opinion was that he believed only what he was paid to, and only while the payment was good. When the war began, he left that position and, along with fellow Council member Contrail, joined Megatron's Decepticons. Nowadays, Ratbat is one of Soundwave's agents, but spends most of his time away from the others. What he does during this time is what he always does best, and that is masterminding incredibly complex financial schemes and scams to drag his targets in the red while he rakes in the credits. And they say war changes people...
Ratbat generally made useless interjections during Megatron and Orion Pax's hearing before the High Council, humiliating Orion when he joked he could imagine an end to their session when the young librarian complained the caste system had rendered the society imaginationless. Ratbat became more serious when Halogen began to concur with Orion and Megatron's beliefs, and was informed that no matter what, it was the beginning of the end for the castes. Ratbat then mentioned attempts to find the Matrix of Leadership had been made by the rebels, and uncharacteristically commented since it had not been found, the Matrix was unwilling to give itself up. This in turn led to the Council's unanimous vote for Orion to become Optimus Prime and be given the quest to find it. An enraged Megatron killed Halogen, declared war and called the Decepticons to follow him. Optimus noticed Ratbat boarded Contrail and left with the Decepticons. During the war Polyhex, Ratbat's home, quickly fell to the Decepticons. Teracycles later, Ratbat's cowardly survival was notable enough for Teletraan-1 to inform Omega Supreme of it.