Thunderdog is a spoof of Underdog who appeared in Back in Style. In the 1960's, his show was the third to feature guest appearences by the Warners. He was about to use his magic feather to fully regain his strength, however The Warners appeared and Yakko told him to use his wit, taking the feather and Thunderdog ended up being flatened by a weight he was holding. His legs never un-flattened and he was forced to walk with a stool ever since.