20 000 lieues sous la mare

When Gorgious tries to flood the bathroom, wasting water when he falls asleep in the bathtub, Candy opens the bathroom's door and soaks the aliens' entire house. Etno then has a brilliant idea to flood the entire house into an aquatic-like atmosphere to keep human tenants away forever. However, two hydrologists, Professor Coustel (whose surname is a pun on that of Jacques Cousteau) and his assistant Bernard move aboard the submarine to observe some of the rare aquatic species (including the aliens themselves, who transformed themselves into a seahorse, lobster, two-headed octopus, electric eel and piranha with the SMTV so they were able to breathe underwater).

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S01E38 - Bongo Park