Capt. Nemo is comprised of two Jules Verne books which feature this idealistic and ingenious captain. 20,000 Leagues Under the Sea is a classic science fiction telling the story of Captain Nemo and his submarine Nautilus as seen from the perspective of Professor Pierre Aronnax. The Mysterious Island is a sequel to Verne's famous Twenty Thousand Leagues Under the Sea and In Search of the Castaways. The story tells the adventures of five Americans on an uncharted island in the South Pacific.