Mr Mischief plays tricks on everyone, but one morning when some strange things begin to happen in his house, he wonders who is responsible. Until he meets a Leprechaun, sitting at his kitchen table! Mr Mischief and the Leprechaun decide to join forces in a spot of mischief making. The poor Mr Men and Little Misses are in for some surprises! But who will win in the battle of wits and tricks?