Invisible creatures created by telekinetic radiation experiments are on the loose at an American military base in Canada, sucking out the brain and spinal chords of their victims. Base personnel have their hands full figuring out just what the hell is going on until a local scientist provides the answer. And then the little bastards show themselves.
Spooky little gem that shocked audiences of the day due to its violent content. The climatic showdown where the monsters are revealed is a classic, featuring some impressive stop-motion animation and gore.