In North Dakota, Dan O'Grady returns from Ireland, where he tricked the Leprechaun and stole his gold coins. However, the Leprechaun has followed him and kills his wife Mrs. O'Grady, but Dan succeeds to lock him in a box in his basement with a four-leaf clover on the top of the box. Dan is ready to torch the house, but he has a heart attack before the arson. Ten years later, J.D. buys the derelict house by a very low price, and moves from Los Angeles with his spoiled teenage daughter Tory Redding intending to renovate the house. He hires the three-man company composed by the handsome Nathan; the intellectually disabled Ozzie; and the smart boy Alex to paint the house, and Tory shows attraction to Nathan. When Ozzie goes to the basement, he accidentally removes the clover from the top of the box, unleashing the little monster. But nobody believes him and the Leprechauns wants to retrieve his one-hundred golden coins, beginning a crime spree.