An aged crime boss named Maximilian Greco discovers Ripster and Streex fighting Killamari and Repteel at a nearby zoo as part of Dr. Piranoid's plot to obtain animal specimens for his Genetic Engineering Chamber. Upon tracing Killamari and Repteel back to Dr. Piranoid, Maximilian Greco blackmails him into enhancing him with the strength of a rhinoceros and the longevity of a desert tortoise. Maximilian also has Dr. Piranoid have his chihuahuas Zeus and Apollo enhanced to fight the Street Sharks.