Erik Selvig is a fictional character portrayed by Stellan Skarsgård in Marvel Cinematic Universe films Thor, The Avengers, Thor: The Dark World, Avengers: Age of Ultron, and Thor: Love and Thunder as an astrophysicist who becomes involved with the Asgardian Thor and the government organization S.H.I.E.L.D. To tie into these appearances, the character is seen in several MCU tie-in comics. Wikipedia