Rex Robot is evil, intimidating, and ruthlessly loyal to his master, Professor Bug, and stops at nothing to fulfill his master's wishes.
Looks
Rex Robot is extremely different from the robots in Mega City. He is much bigger and taller, has a black paint job, a blood-red color scheme, bright red eyes, and a grave low pitch voice.
Appearances
Rex Robot has appeared in one episode of The Backyardigans: "Robot Rampage: Part 2" from season four.