Transformers Gen1: Season 1 Ep 11 - Ultimate Doom: Brainwash (part 1)

The Decepticons captures Sparkplug to use him as a guinea pig of a "Hypno-chip." The Decepticons will use this to make anarmy of brainwashed humans to build up a new "Space-bridge" big enough to bring Cybertron down to the Earth's orbit, regenerating the energy of Cybertron, but destroying the Earth.