Just north of the border, in the tired coastal town of Imperial Beach, California, the lives of three generations of surfers are upended by the appearance of a mysterious stranger.

After enlisting a young woman, to infiltrate the Yost inner circle, Linc pays Mitch a visit, looking to sponsor Shaun and promising not to resort to "bad boy" image tactics. Mitch allows Shaun to compete in a Huntington surfing competition, with unexpected results.

A kiss from Zippy convinces Dr. Smith that a paranormal phenomenon has occurred among the Yosts. Bill interrogates interlopers outside the Yost house. Kai tests John to see if he's a man of his word. Mitch is comforted by Cass, unaware of her connection to Linc.

John gets roughed up by some thugs; Kai connects with Butchie; Vietnam Joe brings Dr. Smith a new patient; Shaun's adult-film star mother Tina arrives in Imperial Beach.

Bill gets a strange mandate from Zippy; Tina lets the Yosts know she's back in town.

Butchie orchestrates a reunion between Shaun and Tina; John helps Bill and Cissy face up to their pasts.

Linc's Stinkweed reign is challenged; Dwayne eyes Shaun's online future; Dr. Smith tends to an ailing Palaka; Ramon supervises the building of a shuffleboard court.

An ominous message from John strikes fear for Shaun's safety into the hearts of Imperial Beach denizens.

Attempting to conjure some courage, seeks helps south of the border; Cissy heads up a citywide search team to find Shaun; Bill loses a trusted source of information; Palaka's good-luck gift to Freddy ends up with an unintended recipient.

Butchie and Kai wake up to a joyous revelation; Imperial Beach plays host to a makeshift parade organised by a revamped Stinkweed.