Cogwheel was a Cybertronian doctor and colleague of Ratchet prior to the Age of Wrath. Noted for resembling Arachnicons, she possessed multiple limbs that allowed her to employ several tools at once, something she did with great precision. She was called upon by Ratchet after he had operated on Coldwelder, a Cybertronian who claimed that he had been abducted, in order to give Ratchet her opinion. Faced with evidence that aliens-later revealed to be the Quintessons-had indeed been operating among them, Cogwheel questioned what they could do about it, given that at that time Cybertron possessed no real form of government.