Both the Avengers and the Guardians of the Galaxy seem to spin around the 6 Infinity Stones. In Thor: The dark world, the Aether is given to the Collector. He explicitly says "One down, five to ...
During the course of the Avengers, you see Mr Banner talk about his alter ego as just another entity inside of himself. Afraid, reluctant and very much un-willing to let him out, even if it means his ...