 Jack jumps in after him, saving his life (because water is the only thing that can kill the immortal leprechauns), then Seamus Muldoon (Colm Meaney), the saved leprechaun, becomes Jack's new friend.Seamus introduces Jack to his wife Mary (Zoë Wanamaker) and his son, Mickey (Daniel Betts), and shows him the mystical world of the leprechauns.The "solitary fairies" (which includes leprechauns) love to play tricks on others, especially on the snobbish "trooping" fairies.