Every year, Horrid Henry's birthday parties are a nightmare for his parents. They always say they will never let him have another party, but they always give Henry another chance the following year. This year, Henry wants to go to laser zap, but he is banned for the trouble he caused there. His party is held at home, but it has games which Henry hates like 'Pass the Parcel'. Then Henry decides to use his new present - his Super Soaker 2000 Water Blaster - to make things a little more interesting...