While repairs are made to the Nautilus, Nemo takes Jean and Nadia on a tour of his base. They discover wondrous sights -- a massive world tree, frozen dinosaurs, "moving" walkways, and a chamber filled with penguins. But the most spectacular sight of all is a massive (and ancient) whale named Irion, who happens to be close friends with Nemo. When Nadia speaks to the whale, he reveals that the latter will soon find her father… as well as her own brother. The children then witness a breathtaking aurora on the surface of Antarctica with Captain Nemo. The episode ends with Jean sharing his newest invention with Nadia and Marie -- a machine that creates ice cream, using the ice from Antarctica.