
Set on a distant planet in a far-off galaxy, "Leprechaun 4: In Space" tells the story of a mischievous and power-hungry Leprechaun who has set his sights on an alien princess. Capturing her as a hostage, he intends to marry her to claim her royal title. With the princess's title strengthening his claim and his hoarded gold, the Leprechaun hopes to amass enough power to rule the entire universe.
However, the Leprechaun's plans are interrupted when a group of elite Earth marines arrives on a rescue mission, determined to save the alien princess and thwart his ambitions. The marines' unexpected approach catches the Leprechaun off guard, but he is a seasoned trickster who won't give up so easily. Known for his cunning and magical abilities, he devises a plan to follow the marines back to their spaceship.
Hidden aboard the orbiting vessel, the Leprechaun unleashes chaos among the crew, using his devious tricks and powers to hamper their efforts. His single-minded goal is to recapture the princess and resume his quest for universal domination. As the marines struggle to maintain control and protect their mission, they must also contend with this unpredictable and malevolent force lurking in their midst.