Listen to the "Underdog" and you'll find out whose voice is that. It's of Jason Lee who is lending his voice to the title character of the adventure comedy flick.
A live-action classic 1960s cartoon, "Underdog" followed the adventures of a humble dog named Shoeshine Boy who became the superheroic Underdog, who spoke in rhyme.
In the movie, he is adopted by a 12-year-old boy and uses his superpower to protect his love, Polly Purebred, and the citizens of Capitol City from the evil Simon Barsinister. Peter Dinklage has been cast as Barsinister. In hand directing is Frederik Du Chau.