It's Leo's birthday and time to celebrate with his friends by having a costume party. What could possibly go wrong at such a fun event? It turns out, when a grumpy magic tree casts a spell, a fun party can turn into a disaster very quickly. All of the guests become trapped in their costumes, and unfortunately some of the party guests were dressed as monsters and other things that don't behave how children should do at a party. Leo dressed as a pirate, which means he is swiftly taken away on a ship. Taylor becomes a tiger who can only roar at her friends. Ivy and Fletcher become two tiny rabbits, who have to avoid becoming tiger lunch. Luckily Jaxon dressed as a superhero, but can he save the day before his best friend walks the plank? Will the Kingsley Kids get out of this mess or will they be stuck in their costumes forever?