Brady and Boomer want to join the Riptides, a gang famous for pulling pranks all over the island. Their final test before they will be accepted into the gang is stealing Yamakoshi; Lanny's pet fish.

Brady and Boomer decide that their island needs some fun, so they decide to pull pranks on everyone. No one likes their pranks, but the kings fear that bad karma is coming their way. Meanwhile, Mason gets addicted to a video game.

Mikayla comes down with a fever and starts to turn into a Waka Waka Bug. So Boomer and Brady go to the Waka Waka Bug's hive to try to get the rare medicine to cure her.

The kings discover that they are about to be forever remembered by their Chicago high school class as having thrown the worst party ever. Against Mason's advice they bring the entire class to Kinkow for the best Beach Party ever. Lanny switches beach signs and the party heads for the hunting grounds of the giant Kinkow Sand Maggot who has its own ideas for party snacks.