Captain America is a fictional character, a superhero, who first appeared in Captain America Comics #1 dated March 1941 from Timely Comics, a predecessor of Marvel Comics. Captain America was formally reintroduced in The Avengers #4 dated March 1964, which explained that in the final days of World War II, he had fallen from an experimental drone plane into the North Atlantic Ocean and spent decades frozen in a block of ice in a state of suspended animation and was revived.
In "Our Idiot Brian", Stewie accuses Brian of being as useless as the Black Widow of The Avengers when he prefers to stay dumb. Black Widow is questioned by Captain America, Iron Man, Thor, The Incredible Hulk and Hawkeye as to her powers, which she only offers up as kicking. While the rest of the team jokes at her expense, Hulk tries to stay out of it, but is accused of just trying to be nice.