"The Ultimate Weapon" is the 21st episode of Gadget and the Gadgetinis.
Meanwhile, Penny has given the Gadgetinis experimental digestive systems, so they can eat and turn the food into electricity. They quickly become addicted into eating and try everything, which makes the digestive systems overload and emit noxious odors, so they win the contest. Gadget is happy to get the cheque, but the problem is that the contest is a front for a M.A.D. plot. The winning animal is to be squished and their concentrated stink extract used to arm an orbiting stink bomb which will cover the world with a foul-smelling stench. Then M.A.D. will sell the scent neutralizer their chemists created for a fortune since everyone in the world will be a customer. Since the Gadgetinis won, they're taken to the squishing machine and Gadget's too happy to have won $1,000,000 to interfere, so it's up to Penny (who feels guilty for putting the Gadgetinis into danger) to save the day.