If that wasn't enough, it actually gets even weirder as it goes on. In the second half of the series, Sigma gets replaced by a new set of villains called the Dinosaur Army, and ... well, take it away, Wikipedia:
"The Dinosaur Army is led by an ancient monster, Triple Neck Demon (Majin Mitsu Kubi). It's a three-headed dinosaur or dragon. One head of this ancient beast spits fire, one poison gas, and one a bolt of energy. Triple Neck Demon's chief aides are the human worshipers Devil Hat (Akuma Hatto) and Queen Meza (JyouOu Meza). Devil Hat makes the dinosaur-shaped robots for the Dinosaur Army and uses his hat like a weapon (he throws it)."
There's actually a highlight reel from the original series that plays under the movie's credits showing shots and characters lifted directly and recreated for the film, but just so we're clear on this, that's the level of bonkers that we're starting with. The movie was meant to be even weirder than that, and brother, did it get there.