Avengers : Season 1, Episode 4: "Meet Captain America"

"Meet Captain America" - In the closing days of World War II, Captain America and Bucky join forces with Jack Fury and his Howling Commandos for a final confrontation with the Red Skull and his HYDRA forces! But as the battle unfolds, they’re being watched by a visitor from the future. His name is Kang the Conqueror, and he’s on a mission to save the world.