Welcome aboard the Purple Medusa, a magnificent ship that cruises the Seven Seas. Its crew of young sailors are ready to help save the planet on exciting missions.

The Purple Medusa is headed for the North Pole and the ice floes! The apprentice sailors are taking part in a mission to take samples from the ice for the Polar Institute. Global warming, endangered animals, encounters with the Inuit people... Tallulah, Alice, Hugo and the crew of the Purple Medusa are in for a memorable adventure and a dangerous encounter with mean pirates in this icy universe!