Iris and Isidore bring Bernard a couple of extremely rare, chequered piranhas - a species on the verge of extinction! Bernard feels he’s entrusted with a noble mission, he must SAVE THE SPECIES! He‘ll sacrifice everything he’s got for these piranhas. His kids - feeling abandoned - move in with the Marsus. Bernard resorts to dangerous methods to save an endangered species. Before he knows it, hundreds of chequered piranhas, being amphibian, swarm out of the aquarium –- and devastate the compound! Bernard is overwhelmed, what can he do? It takes every resource possible - kids and Marsus combined - to fight off the powerful menace about to destroy everything in sight!