Jem and The Holograms are invited to perform at a concert in St. Thomas and travel aboard a luxury ocean liner to get there. Eric and the Misfits, who are convinced there's a publicity stunt going on, tag along to cash in on it. Later that evening, after giving a performance for the passengers and crew of the ship, Jem and the Holograms are tricked by the Misfits into hiding aboard a lifeboat under the misconception of giving the ship's captain a surprise for his birthday. But when the prank goes wrong, it maroons the Holograms and the Misfits on a tropical island. The girls, despite their rivalry must try to survive and get help from a hermit living on the island.