In the new Avengers: The Age of Ultron, Tony Stark wants to rekindle a dormant peacekeeping program. Things backfire with his plan and The Avengers are forced to reassemble to save the world against the bad guy Ultron.

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The Avengers: The Age of Ultron

The movie comes out in May this year. In the mean time, check out these awesome concept art pieces for Avengers: The Age of Ultron: