Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
Members of a secret government agency force a psychic (Alex - Dennis Quaid) to help them experiment with sending psychics into other people's dreams. When Alex gets into the dream of a young boy troubled with terrible nightmares, he discovers that the source of the nightmares is a creature the boy calls The Snakeman. He's not really a snake, since he has arms and legs, but he does have the hooded head of a cobra and fangs, and the name, of course, so I'm including him here. This was made in 1984 so the effects are pre-computer graphicsI and they're very cheezy. He looks like he is made of rubber because he probably is. The Snakeman shows up again in a second dream when another psychic (Tommy - David Patrick Kelly) who has learned how to kill people in their dreams, turns himself into Snakeman based on a drawing that Alex made of the monster in order to scare Alex who is in the same dream. We see him transform into the Snakeman with old-style progressive animated-type effects. Then the Snakeman shows up again in a third dream when Alex turns himself into a different-looking version to scare someone else to death.