Ultimo
Ultimo is the villain of the movie that the starlet Delta Aurora starred in.
As the filming progresses, Sparky accidentally discharges a real Galactic Guardian thermal torpedo launcher (believing it to be a prop), destroying Maximus' citadel; Maximus believes it to be the work of the movie's villain, Ultimo, who, in the film, declares himself to be the supreme evil overlord. Unaware of the fact that Ultimo is merely a character in a film, Maximus arrives on Earth, intent on destroying Ultimo; Betty is forced to lock Aurora in her trailer and the actor portraying Ultimo in a porta-potty before having X-5 rig a prop spaceship to fly into outer space, luring Maximus away from Earth. With Maximus gone, the filming continues.