
An old colleague of
Jane Foster's father,
Selvig is working with her to carry out her wormhole research, resulting in him being present when Thor arrives on Earth after his banishment. Having grown up with tales of the
Viking myths, Selvig recognizes
Thor's 'stories', but assumes that they reflect a delusional mental state even after
Jane's assistant speculates that the
Norse gods could have been an advanced race who came to Earth. However, he and
Thor bond after they spend the night drinking in a bar after he helped
Thor escape S.H.I.E.L.D. custody.
It is suggested that
Selvig also knows
Bruce Banner; after SHIELD has taken Jane Foster's equipment, Selvig says that he knew a scientist who was a pioneer in gamma-radiation, but after
SHIELD showed up, no one heard from him again.
When
Lady Sif and the
Warriors Three appear outside
Jane's lab,
Selvig doesn't understand what is going on until
the Destroyer appears soon after attacking the town. During the course of the battle, he witnessed the amazing abilities of the Warriors Three and begins to believe
Thor's identity. In the midst of the destruction he concedes to following Thor's instructions.
Later in the aftermath of
Thor's renewal of his powers and reclamation of his hammer,
Selvig no longer doubts Thor's beliefs or identity. Jane and he travel with Thor and the other Asgardians to the wormhole as they depart from Midgard.
In a post-credits scene, Selvig meets with Nick Fury and is offered the chance to study the Tesseract, but is already being observed by Loki.
The Avengers
Currently working for
S.H.I.E.L.D. investigating the Tesseract,
Selvig comes under
Loki's control when Loki emerges from the portal generated by the
Tesseract. He subsequently helps
Loki devise a device that will allow him to generate a larger portal to bring in a massive invasion fleet to conquer
Earth. When
Loki's plan is about to be fulfilled,
Selvig brings the
Tesseract to the top of
Stark Tower, and uses it to open a portal to the
Chitauri's world. When the aliens starts to spawn on Earth,
Selvig is reached by the
Avengers, who try to stop him and fail.
Selvig reveals to them that the force field surrounding the Cube is unbreakable, and that nothing can be undone. He is knocked out by the force of the portal immediately after.
When he wakes up,
Selvig finds himself alone with the
Black Widow, who's trying to close the portal. Back to himself,
Erik reveals to her that some part of his consciousness was still awake during
Loki's mind-control, and that he inserted a flaw in the god's plan: the force field around the
Tesseract can be undone with
Loki's scepter. He is last seen standing with
the Avengers as
Thor takes
Loki and the
Tesseract back to
Asgard.