Actually, a neat idea for a crossover would be a time travel plot involving inspector gadget. He could time travel to colonial New England (Liberty's Kids), the 80s (Hulk Hogan's Rock n Wrestling), and the future (C.O.P.S.) with Dr. Claw also somehow being sent back in time as well, working with the villains of those shows, and gadget, penny, and brain thwarting the evil schemes (though liberty's kids doesnt really have any villains, save the redcoats and benedict arnold if they ever did an ep involving him).
Not feasible. DIC no longer owns Gadget (Disney does) or has a license for WWF/E and the C.O.P.S. toys. Once again, we're veering into fanfic.