Prime Evil enlists the help of the Wailing Banshee to flood cities with her storm-causing screams. Futura researches the Banshee and tells the Ghostbusters that only leprechauns know how to beat her. They travel to Ireland to try to find a leprechaun. Despite Prime Evil sending Fib-Face to distract them, they find one and convince him that they don't want his gold, they want his help. He agrees to help and defeats the Wailing Banshee with a magical arrow.