The Avengers is a superhero team from Marvel Comics, first appearing in 1963. Loki is a villainous Asgardian god of mischief and the adoptive brother of Thor. He is portrayed by Tom Hiddleston in the Marvel Cinematic Universe. The HULK is a powerful green-skinned alter ego of Bruce Banner, a scientist who is transformed into the monster when enraged. He is portrayed by Mark Ruffalo in the Marvel Cinematic Universe. STEED is the code name of John STEED, a secret agent in the British television series The Avengers. He is portrayed by Patrick Macnee in the series.