In this animated series, humble and lovable Shoeshine Boy, is in truth the superhero Underdog (Cox). When villains threatened, Shoeshine ducked into a telephone booth where he transformed into the caped and clumsy costumed hero. As part of their nefarious plans, the villains almost always managed to menace Underdog’s crush, canine TV reporter Sweet Polly Purebred (MacMillan). Each episode was broken up into segments and also featured Tennessee Tuxedo and his Tales, Go-Go Gophers, Klondike Kat, Commander McBragg, and the Hunter.