During Saint Patrick's Day, Scott Jones encounters a lonely but charitable young leprechaun boy named Leo Saint who befriends him and becomes best friends. But his father is now suspicious of Leo and thinks he's related to one of his old archnemesis from his past and tries to protect his son from Leo. Although Leo is the great-grandson of a Nelwyn sorcerer Willow Ufgood, the Joneses are hunted by Willow's evil counterpart, an evil homicidal leprechaun Lubdan Buttowski who searched for a perfect bride when he kidnapped the neohuman Oscar Kessel's girlfriend Annika Masson, forcing them to enlist the supernatural hunters to rescue her from Lubdan.