After looking up information about dinosaurs on his computer, Patrick is awakened by a dinosaur who arrives in a spaceship to take Patrick to his planet for show and tell.
In prehistoric times, a 50-foot-long mother crocodile defends her eggs and newly hatched young from attacks by bird eating dinosaurs and Tyrannosaurus Rex.
While playing a harmless Halloween prank on crabby "old mother witch," David discovers she has had a heart attack and his make-believe night of terror becomes all too real.
Professor Potts discovers some big old bones and puts them together in various ways until he is satisfied he has discovered a dinosaur that once ruled the earth.