Matt Damon will star in Alexander Payne’s social satire “Downsizing” and is exiting Legendary Pictures’ “The Great Wall.”

“Downsizing” has been written by Payne with Jim Taylor. The story centers on a man in the near future who realizes that he would have a better life if he were to shrink himself at a time when humans are able to shrink themselves to battle over-consumption and the depletion of earth’s natural resources.

Payne and Taylor won an Oscar for adapted screenplay for “Sideways.” “Downsizing” has not been set up at a studio yet.

Damon is committed to Ridley Scott’s “The Martian” and another installment of “The Bourne Identity” for Universal with Paul Greengrass directing.

Damon is repped by WME. Payne is repped by CAA.

The news was first reported by Deadline.com.