A pirate ship is about to attack the village where Petit Potam and his family live. The little hippopotamus reveals the imminent danger to the adults. No one believes him though, and everybody laughs at his supposed imagination. He runs away into the jungle, where he has to face many problems… first of all, he cannot swim. However, he meets a young tiger of the same age that teaches him to survive. Together, they will try to save the village.
