He-Man and the Masters of the Universe 1x29

Negator, an evil character with a love of computers and electronics, sees Man-At-Arms testing out his latest invention, the Beam Ray, in the desert. Impressed, Negator wants the scientist to come and work for him, so that he can use his creations for his own evil purposes. When Man-At-Arms refuses, Negator captures Teela to force him to come to him. As He-Man, Ram Man and Battle Cat search for their missing friends, they are sucked into Negator's underground electronic domain, and Negator sends He-Man and Ram Man into his living electronic "game"...