Dynamic Duo dummies made of rubber. Rubber was a type of plastic that was used to make Wellington boots. In order to lure Superman into a trap, Doctor Hiram Gulliver used rubber dummies that resembled Batman and Robin, in order to make the Man of Steel believe that they were in peril. References ↑ As seen in Gulliver's Gigantic Goof (1973). ↑ As seen in The Weather Maker (1973). ↑ As seen in Gulliver's Gigantic Goof (1973). External Link Rubber at Wikipedia Retrieved from "https://superfriends.fandom.com/wiki/Rubber?oldid=62508" Categories: Materials Community content is available under CC-BY-SA unless otherwise noted.