Quicksilver (real name Pietro Maximoff) is a character from Marvel Comics who is the twin brother of fellow Avenger, Wanda Maximoff, alias Scarlet Witch. He is a recurring character of the Marvel Cinematic Universe. He first appears as a cameo in Captain America: The Winter Soldier, then returns as one of the titular characters of Avengers: Age of Ultron, and later as a flashback character in the Disney+ series WandaVision.