The story for Kamillions is very simple: A scientist has been working on opening a portal to another dimension, and today on his 50th birthday (and coincidentally while his family prepares a birthday party for him), he succeeds. In this other dimension, he sees lifeforms that resemble horseshoe crabs moving around and he notes the activity of these crabs. After the window on his portal machine thing breaks, the scientist Dr. Nathan Wingate (Harry S. Robins) gets sucked into this other dimension, and two of these crab creatures jump out. These crab like creatures have the ability to replicate itself into the image any living body it can come into contact to, or can see (now you can figure out how they got the title). All of this craziness happens as the guests are arriving, and any of the guests are prime targets for this mighty morphin spectacular.