When Billy Peltzer is given a small creature called a Mogwai by his father, he is unaware of the carnage he is about to encounter. There is a huge responsibility in looking after Gizmo as there are certain rules which must be followed. The Mogwai must be kept away from bright light, never made wet and never, ever be fed after midnight. When an accident occurs involving Gizmo and water, the next evolution stage of the Mogwai appears, and it isn't nice at all.