All aboard for mischief and mayhem as the twins Zack and Cody board the SS Tipton to attend the Seven Seas High School.

London escapes the Seven Seas High and the ship must stop at Parrot Island to search for her; her friends get arrested inland and may not make it back on the ship.

Zack goes broke buying gifts for the girls aboard the ship; Cody enters a yo-yo competition to impress Bailey.

Violet's snobbish mother and rich would-be boyfriend Aaron try to keep Zack away from her by pretending he has stolen her valuable necklace, called The Kidney of the Sea.

Zack and Cody sneak out after curfew to see the ship's cabaret show, Starlight Follies, to check if one of the dancers is their teacher Miss Tutweiler.

The ship gets struck by lightning and Cody finds himself stuck living the same day repeatedly. He tries to use the time to let Bailey know how he feels about her but it is not as easy as he thought it would be.