Captain Nemo and his crew are forced to make a stop on the island of Karajan for water and supplies. Nemo discovers a shocking truth and Humility and the crew find out who Nemo really is.

When an eerie red glow appears, the giant eel suddenly releases the Nautilus, it turns out to be a chain of underwater volcanoes. Without steering power, the Nautilus continues to sink towards the dangerous lava - and it soon becomes clear that only Humility can save the crew.