Fourth installment of the horror franchise. In his quest to rule the universe, the Leprechaun (Warwick Davis) takes to outer space, where he kidnaps an alien princess and plans to marry her. However, when a platoon of space marines are sent to rescue the princess, the Leprechaun discovers a sinister half-human, half-computer doctor who wants to use her DNA to restore his body to its former self. Soon the scene is set for a showdown between the evil Leprechaun, the marines, and a gigantic blood-sucking monster, while their spaceship's timer is counting down to self-destruction.