Ro-Man was evil and deadly.
He attacked planet Earth and killed most of the Earth population with his Calcintion death ray. Soon he kills all the humans except eight survivors. With two gargantuan lizards at his disposle, he sets off to kill the survivors, but he is eventually killed in the end by his own death ray, but these events are later revealed to be just a small boy's dream.
- Robot Monster is one of the most popular so bad movies alongside films like Plan 9 from Outer Space and Gamera.
- Ro-Man also made a cameo as one of the illegal aliens (along with 2 Daleks) that were freed by Marvin the Martian in the movie, Looney Tunes: Back in Action.