Before he was a doctor, Ratchet was one of the most brilliant engineers on Cybertron. He was well known for his ability to put machines back together as well as designing weapons, his fame even reaching as far as Caminus. But when he saw what those weapons did during the war, he gave up engineering to devote himself to medicine. Embittered by how Optimus Prime had only prolonged the conflict, he established a hidden clinic inside an abandoned theatre where he committed himself to helping anyone.