Underdog's cape is blue.
Underdog is a superhero character that originated in an American animated television series of the same name that aired from 1964 to 1973. The character is depicted as a humble and mild-mannered shoeshine boy named Shoeshine Boy who transforms into the superhero Underdog to save the day. Underdog's costume consists of a red shirt with a large "U" emblem on the chest, a blue cape, and a red hat with a black band. The character became a popular icon in American popular culture and has since