When Lord and Lady Glenarvan catch a shark during a sailing trip, they are surprised to find a message in a bottle within its belly, sent by Captain Grant of the shipwrecked Britannia. Unfortunately, the water-damaged note is mostly unreadable, giving any would-be rescuers only a latitude and no longitude to work with. Eager to help the castaways, the couple urges the British government to launch a rescue expedition but are refused. So they take it...

A storm strikes a ship carrying Alonso, Ferdinand, Sebastian, Antonio, Gonzalo, Stephano, and Trinculo, who are on their way to Italy after coming from the wedding of Alonso's daughter, Claribel, to the prince of Tunis in Africa. The royal party and the other mariners, with the exception of the unflappable Boatswain, begin to fear for their lives. Lightning cracks, and the mariners cry that the ship has been hit. Everyone prepares to sink.

"There's no choice. If the gyroscope has been off then I'm afraid the ballast system might be under too much pressure. We'll have to surface and dock at the nearest island." Ominous words - particularly when spoken from deep under the ocean in a mini submarine, and with communication to the outside world nonexistent. Yanky, Meni and Eli Bloomenkrantz are off for a short cruise with their Great-Uncle Dave one summer day when they suddenly find themselves...

Taking refuge on the cliffs above the beach during a ferocious storm, the castaway monkeys finally have proof that they are not alone on the island when they come across a masked monkey stunned by lightning and decide to help him.