The Loonatics encounter Adolpho, a mutated dolphin who uses psychic abilities to brainwash sea creatures and destroy any human-made object at sea. It's up to the Loonatics to stop Adolpho and his gang of killer dolphins from taking revenge on the "surface-dwellers" at their next target: Acmetropolis.

Pierre Le Pew convinces Slam and Duck that Slam can become a champion fighter in his private tournament. However, he fails to tell them that the last match is to the death. It's up to the rest of the Loonatics to save Slam before it's too late.