It is 1865, near the end of the American Civil War. Captain Cyrus Harding and his loyal companion, Private Neb Brown, are forced to surrender to Confederate troops. Jack Pencroft, his wife Joanna and their teenage son Herbert are arrested for using their boat to smuggle slaves to freedom in Canada. Faced with the firing squad, these six band together and make a daring escape by comandeering a hot-air balloon. After being blown out to sea in a vicious storm, they drift aimlessly, eventually crash-landing on an isolated island in the Pacific. The castaways struggle for suvival and begin a series of adventures that will lead them to the mysterious Captain Nemo. Based on Jules Verne's classic novel, 'Mysterious Island' is a powerful tale of action and suspense that builds to a startling and unexpected climax.