Underdog's youth and origin remains unknown. Underdog's secret identity is Shoeshine Boy, a shoeshine boy by profession. As Underdog, he is romantically attracted to Sweet Polly Purebred, a news reporter who is also a dog. When he is needed to fight criminals, he ducks into a phone booth and changes his costume with such force that it usually destroys the booth, He uses his super energy pills to enhance his super powers which he keeps in a secret compartment in his ring. As Underdog he tends to speak in rhyme.
Underdog often fought alien menaces and criminals, as well as supervillains such as Simon Bar Sinister and Riff Raff.
He wears a red jumpsuit with a white "U" on it that is clearly too big for him, and an oversized blue cape. He is tan with black ears. As Shoeshine Boy, he wears a pair of glasses.
In the movie, he lives in a world more like our own, in which dogs and other animals are not anthropomorphic, and thus starts off as an ordinary police dog. After being put down by his fellow police canines and leaving. The beagle is abducted by Cad who takes him to Simon's lab. An accident occurs in the labs and Underdog's DNA is modified after he is exposed to DNA concoctions and chemicals. Underdog eventually escapes and is later chased by Riff Raff and his lackeys, then he is hit by a car but he is unharmed. He is taken home by Dan which names the beagle Shoeshine. All other events in the film leads downward as things change.
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