There are dozens of "Transformers" characters, but a few select ones always reappear from cartoon to cartoon, like Optimus Prime, heroic leader of the Autobots, and his nemesis Megatron, leader of the ...

Megatron's traitorous second-in-command, of course he was going to show up on this list somewhere. This nefarious backstabber has been turning against his side ever since he appeared on screen, but ...