The Ultimate Doom: Brainwash (Part 1).Sparkplug gets left behind when all of the Autobots believe they have a major Decepticon problem at Maharaja. In truth, the Decepticons put one over on them to leave their base vulnerable and kidnap Sparkplug. Dr. Arkeville enslaves Sparkplug for Megatron with a hypno-chip as a test of the device. It works and more humans will soon follow. Megatron has a dangerous new scheme in the works, and it includes a new space bridge. As for Sparkplug, it is decided that he can better serve Megatron when among the Autobots, ultimately making them vulnerable to a new attack.