Erik Selvig

Erik Selvig is a character in the 2011 movie Thor as well as the 2012 film The Avengers and Thor: The Dark World. He was portrayed by Stellan Skarsgård. He will return in Avengers: Age of Ultron.

History
In Thor, Selvig with his colleague Jane Foster and her assistant Darcy Lewis traveled in a van to investigate a strange phenomenon, accidentally bump a man who called himself Thor. After taking the man to the hospital, Darcy found in the pictures a man during the atmospheric phenomena, Jane believed that Thor could help them in their research, despite all this Selvig thought that the mysterious man was delirious. When Thor is a prisoner of SHIELD, Selvig helps the Asgardian telling Coulson that he was Donald Blake, his assistant. Later, Selvig was present when Thor regained his powers and defeated the Destroyer. In a post-credits scene, Fury asks Selvig to help them to investigate the Tesseract, while Loki appeared in the reflection of Selvig (implying that Loki was controlling him).

In The Avengers, Selvig was in the facilities of Project PEGASUS, when the Tesseract began to become unstable, suddenly Loki arrives and steals the Tesseract, also with the power of his scepter manages to dominate several agents of SHIELD, including him and Barton. After being controlled by Loki, Selvig thanked the God of Mischief the opportunity to study the cube. Later, Selvig takes the Tesseract to Stark Tower to open the portal that allowed entrance into this world to Chitauri. When Selvig awakens from his trance, he regrets having helped Loki to conquer the Earth.