Geronimo and the gang set sail in the arctic seas to help his old friend Professor Ranoble with her ice research. But the captain of their ship may be up to something big, especially with frequent orca attacks. Based on the Geronimo Stilton animated series 'Attack of the Killer Whale' ('Mamma, che orca!'), written by Mathilde Maraninchi & Antonin Poiree, storyboard by Jean Texier.