Three bounty hunters from space fly back to the town of Grovers Bend, hoping to save local residents from a new batch of Critter eggs.
In the distant future, a federation marshal arrives at a research lab on a remote planet where a genetic experiment has gotten loose and begins feeding on the dwindling scientific group.
Upon graduation from high school eight teens take a seaplane trip, intending to celebrate on Keith's parents' private island. Stormy weather causes the plane to crash and they end up on a deserted isle. They find evidence of other visitors, and soon must fend for their lives against drug smugglers.
