Mark Ruffalo is an American actor who is best known for his role as Bruce Banner/The Hulk in the Marvel Cinematic Universe. He first appeared as The Hulk in the 2012 film The Avengers and has since reprised the role in several other films, including Avengers: Age of Ultron, Thor: Ragnarok, and Avengers: Endgame. He has also appeared in other films such as Zodiac, Shutter Island, and Foxcatcher.