In the animated series, Optimus Prime was originally in the Autobot Academy and friends with Sentinel Prime and Elita One. When Elita is lost on a planet dominated by a giant spider-like aliens, he blames himself for leaving her behind, where she supposedly dies in the explosion of a wrecked Decepticon warship loaded with Energon. Sentinel doesn't forgive him for losing her and Optimus takes full responsibility for Elita's demise. This caused Optimus Prime to wash out of the Autobot Academy. However, Ultra Magnus pulls some strings so that Optimus Prime could be captain of a strange Space Bridge repair crew composed of a war vet named Ratchet, a fledgling cadet named Bumblebee, and his fellow cadet Bulkhead. Optimus is given command of the starship which is the vehicle mode of Omega Supreme.