Transformers

After taking Buster home, Ratchet steels up his resolve to sneak into the Ark and see the fate of the Autobots with his own optic sensors. When he finds the disembodied head of Optimus Prime, it's almost more than the Autobot surgeon can take. But Prime tells Ratchet that this is the time for valor, and that while he trained on Cybertron to be a surgeon, now he must train on Earth to be a warrior. But the Decepticons have not left the Ark unguarded. And while Megatron may be alone, that makes him no less formidable. There's no way Ratchet would be able to revive the fallen Autobots before he is detected... but does he have the strength necessary to defeat Megatron, who was a match for Optimus Prime himself?