The Happy Helpers are hired by Auntie Olina to be judges for a Hawaiian surfing contest at the Banzai Pipeline hosted by Billy Beagle. As Mickey, Donald, Goofy and Pineapple Patty partake in the contest, the Happy Helpers learn about a lifelong rivalry between Grandpa Kai and Grandpa Beagle even after a waterspout strands the two grandfathers and the Happy Helpers on an island.