Finian McLonergan and his daughter, Sharon, emigrate from Ireland to the town of Rainbow Valley in the mythical state of Missitucky. Missitucky is filled with a unique cast of characters, including Woody Mahoney, Woody’s mute sister, Susan, and a corrupt Senator. Finian is intent on burying a pilfered pot of gold, which he believes will grow and multiply because of the proximity of Fort Knox. Hot on his heels is Og, a leprechaun, intent on recovering his stolen treasure from Finian before its loss turns Og permanently human.