Robert Downey Jr. in a comedy of errors

Credit: The Hollywood Reporter

Robert Downey Jr. and Jay Baruchel (TV’s “Undeclared” and Knocked Up) will star in the Ben Stiller-directed comedy Tropic Thunder for DreamWorks Pictures and Red Hour Films.

In the film, everything goes wrong during the making of a big-budget war movie, and the actors end up becoming the commandos they are playing. Downey will play Kirk Lazarus, the greatest actor of his generation and a four-time Oscar winner. Baruchel will play Kevin Sandusky, an unknown actor on the set.

Stiller, Justin Theroux and Etan Cohen penned the screenplay .

Shooting is set to start in July.