Matt Damon's sci-fi blockbuster 'Elysium' is in UK cinemas on 21 August.

Here, the 'Bourne' trilogy star explains the serious message behind the thriller - all about an elite, privileged bunch of people getting to live in luxury on a man-made space station while the rest of the world's underlings struggle for survival on a ravaged Earth.

Who CAN he be talking about? WATCH ABOVE.

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