"Underdog Costume T Shirt Sheer Fly to the rescue at your next Halloween party as Underdog wearing this bright red Underdog t shirt that doubles as a costume! The Underdog Costume T Shirt Sheer has a soft feel and a tailored fit. It features the giant white ""U"" symbol worn by Underdog, the cartoon superhero pooch. ""There's no need to fear, Underdog is here!""".