To save his job, David agrees to a harebrained scheme: bringing back a mysterious package from South America. He finds himself on a cruise with his ex, Tess, his son, Leo, and his bumbling, clueless colleague, Stéphane, whom David is using to transport the package in his place. Everything goes wrong when Stéphane accidentally opens it: an adorable baby Marsupilami appears, and the trip descends into chaos!