In Palombia, the president is throwing a lavish completion ceremony for a colossal project: a dam across the mighty river Huaytoonarro. An event that couldn't leave the Marsupilami more indifferent, for he has other piranhas to fry: Mrs Marsupilami has disappeared. Our friend's nose tells him that it was the doing of Bring M. Backalive, the famous hunter, and he rushes after the kidnapper, soon followed by Sarah and Bip... and then the situation becomes even more complicated!