Johnny Kapahala, a teen snowboarding champion from Vermont, returns to Oahu, Hawaii, for the wedding of his hero -- his grandfather, local surf legend Johnny Tsunami -- and to catch a few famous Kauai waves. When Johnny arrives, he meets his new family including "Uncle Chris" (the 12-year-old son of his new step-grandmother) who resents the upcoming marriage. Chris's only interest is to join a mountain boarding crew led by a teenage bully. When Johnny's grandfather and his new wife open a surf shop that also caters to mountain boarders, they are soon embroiled in a turf war with a rival shop owner who wants to shut their business down.
Johnny Kapahala: Back on Board is a 2007 American sports comedy-drama film released as a Disney Channel Original Movie. It is the sequel to Johnny Tsunami. The movie premiered on Disney Channel on June 8, 2007 with a U.S. viewership of 1.8 million viewers.