Post-credits
Fury shows a scientist a glowing cube and asks him to study it. Someone else is in the room.
Erik Selvig is being quietly influenced by Loki, and the cube is the Tesseract.
Leads to The Avengers
Marvel Cinematic Universe
An arrogant prince of an alien kingdom is stripped of his power and dumped on Earth, where nobody has any reason to be impressed by him.
Post-credits
Fury shows a scientist a glowing cube and asks him to study it. Someone else is in the room.
Erik Selvig is being quietly influenced by Loki, and the cube is the Tesseract.
Leads to The Avengers