Susan and Ed were research assistants to a mad scientist who wanted to train monkeys to drive miniture trucks so that mankind could live in luxury while monkeys did all the work.
Susan and Ed objected to the immoral experiments and the scientist’s drinking problem. They warned him that his drinking jeopardized the experiemnt and his calculations were incorrect.
Despite the warnings, the experiment proceeded. An explosion occured, the toxic chemicals and radioactive isotopes mutated Susan into the animalistic Monkey Baby and Ed into the super-powered Truckstop. The mad scientist was mutated into Professor Monkeyhead. Lethargic Lad #8
Monkey Baby and Truckstop would go on to become members of The Beef League International.