The comedy will also star Robert Downey Jr. and Jay Baruchel. Tropic Thunder follows the story of five actors who go on location to shoot a film in a military camp. Soon the actors are stuck in a real war-like situation.
According to Prodution Weekly, Black will play Jeff "Fats" Portnoy, an overweight comedian who is forced to kick his drug addiction while filming in the jungle.
Filming for Tropic Thunder will begin in July and the movie is expected to be in theatres in July of 2008.