During the World War II, the crew of a small insignificant ship in the U.S. Pacific Fleet experience an event unlike any event ever experienced by the United States Navy. A Ship's Captain is removed from command by his Executive Officer in an apparent outright act of mutiny. As the trial of the mutineers unfold, it is learned that the Captain of the ship was mentally unstable, perhaps even insane. The Navy must decide if the Caine Mutiny was a criminal act, or an act of courage to save a ship...

The oceans during the late 1860-92s are no longer safe; many ships have been lost. Sailors have returned to port with stories of a vicious narwhal (a giant whale with a long horn) which sinks their ships. A naturalist, Professor (Pierre) Aronnax, his assistant, Conseil, and a professional whaler, Ned Land, join an US expedition which attempts to unravel the mystery.