The Avengers (2012 PG13)

The Asgardian Loki encounters the Other, the representative of an extraterrestrial race known as the Chitauri. In exchange for obtaining the Tesseract, a powerful energy source of unknown potential, the Other promises to provide Loki with an army to conquer Earth. Nick Fury, director of the covert agency S.H.I.E.L.D., arrives at a remote research facility where astrophysicist Dr. Erik Selvig is leading a team studying the Tesseract. It suddenly activates and opens a portal, allowing Loki to reach Earth. Loki steals the Tesseract and uses his scepter to enslave Selvig and other agents, including Clint Barton, to aid him.