Underdog is an American animated television series created by W. Watts Biggers in 1964. Stories are mainly about a mild-mannered shoeshine boy by day transformed into superhero Underdog whenever Polly Purebred is in trouble. Underdog was very popular in the USA and was one of the most memorable movies in American adults' heart. Underdog's most common saying when he appeared was, "There's no need to fear; Underdog is here!" When facing the damages he caused, he just replied, "I am a hero who never fails; I cannot be bothered with such details."