Overcoming a crippling lack of screen presence, a scientist named Paul has very nearly perfected technology that will allow the world to transport mice from one side of laboratory to another. His boss Mr. Blanchard wants him to fail; something having to do with blackmail by a guy with the largest eyebrows in Europe. Accordingly, Blanchard sabotages a demonstration in front of a Teutonic dignitary named Lembach who controls mouse-transporting funding decisions; in a hasty rage, Paul tries to project himself into his boss's dining room and messes up. He becomes sort of a half-something, maybe it's a rat now that I think of it, but I wouldn't worry about it too much if I were you. Whatever he is, he has big teeth and even more pockmarks than before.

So, he starts killing people even though he still seems like sort of a rational guy. His old girlfriend (also a pale scientist; everyone in this movie is a pale scientist or a pale grantmaking bureaucrat) tries to talk him out of it, as does his lab assistant, but they're too busy falling in what passes in England for love to make much of an impact on his spiral into the pits of semi-rat hell. He's dead by the end, and you know what? I was basically fine with that.