The sequel series, "" saw Optimus contacting Bumblebee to warn him of danger on Earth—a prison ship's complement of Decepticon prisoners escaping upon the ship crashing and appearing briefly in physical form to help Bumblebee's unlikely new team defeat the Decepticon Underbite. Optimus appeared throughout the first season as a vision to Bumblebee, though he was only allowed to do so when the latter's need was dire. Residing in the "Realm of the Primes", Optimus Prime began training to combat an "ultimate evil" where his first part of the training was overseen by Micronus Prime.