It is 1866, and there is trouble in the world's oceans. What is the extraordinary thing that people have seen there, travelling faster than a whale and cutting holes in the bottom of the strongest ships? Dr Aronnax joins the search for the 'monster', hoping for an exciting adventure. But when he meets the mysterious Captain Nemo, his adventure becomes more extraordinary than he had ever imagined, and he discovers a new underwater world, full of wonders, but of strange dangers too...