A murderous baboon escapes from a laboratory and roams the research building, and begins to kill some teenagers who are also in the building playing a Dungeons-and-Dragons type game.

Upon the return of Charlie Puckett to the small town of Pakoe, a series of teenage beheadings begin. Intent on finding the culprit, Sherrif Carl Carson soon begins to suspect that Charlie's return may be more than meets the eye.