"Nature of the beast" is one of those "Never-ever-pick-up-a-hitchhiker"-thriller/horror-movies and it's probably a good example of this genre. The cast is terrific (you just can't go wrong with Henriksen and Roberts, even Brion James is in this for two minutes) and the movie is pretty exciting and fun to watch... until the last 5 minutes, when the writer/director manages to gloriously mess it up with an incredible stupid and forced twist-ending, that isn't just unlogical, but annoying as hell, too. Pretend it doesn't happen...