A lone-wolf scientist sequestered in a mansion near a small desert town arouses the suspicion of the town’s doctor when his lab assistant is found dead from a case of acromegaly which took only four days to develop. As the doctor investigates, aided by the scientist’s new, and very female, assistant, they discover that, far worse, something much larger and hungrier than it ever should be, is devouring local cattle – and humans – in increasingly large quantities.

In Prague, a professorial puppet, with metal pincers for hands and an open book for a hat, takes a boy as a pupil. First, the professor empties fluff and toys from the child’s head, leaving him without the top of his head for most of the film. The professor then teaches the lad about illusions and perspectives, the pursuit of an object through exploring a bank of drawers, divining an object, and the migration of forms. The child then brings out a box with a tarantula in it: the professor puts his “hands” into the box and describes what he feels. The boy receives a final lesson about animation and film making; then the professor gives him a brain and his own open-book hat.

Giant lava breathing tarantulas – Lavalantulas – erupt out of ancient volcanos in the Santa Monica Mountains, raining death and destruction upon Los Angeles. With the City of Angels on the verge of incineration, only a washed up ‘90s action hero actor stands in the way of this monstrous swarm of bloodthirsty creatures who burn their victims alive.