Transformers: Generation 1

Victor Drath has had enough of the Autobots ruining his plans. He secures help from a mysterious man named Old Snake in making for the beginning of a deadly plot against Autobot City. A sneak attack disables Rodimus and his comrades. Then, they are surprised to wake up in artificial human bodies. Drath and Old Snake intend to finish them off and strike the city with the Autobots' own robotic bodies. Lacking their usual weapons and abilities, the Autobots must get by as humans and foil their enemies' plot to destroy Autobot City in order to regain their bodies.