Bruce Banner: I'd like to know why S.H.I.E.L.D. is using the Tesseract to build weapons of mass destruction.
Nick Fury: Because of him.
Nick Fury: Last year, Earth had a visitor from another planet who had a grudge match that levelled a small town. We learned that not only are we not alone but we are hopelessly, hilariously, outgunned.
Thor: My people want nothing but peace with your planet.
Nick Fury: But you're not the only people out there, are you? And you're not the only threat. The world's filling up with people who can't be matched, that can't be controlled.
Steve Rogers: Like you controlled the Cube?
Thor: Your work with the Tesseract is what drew Loki to it, and his allies. It is a signal to all the realms that the Earth is ready for a higher form of war.