Downey to Portray Black Man in Summer Comedy Film

In "Tropic Thunder," one of three summer films featuring Robert Downey Jr., the actor appears on screen as a black man.

Downey Jr. plays overly committed actor Kirk Lazarus, a white man cast to play a black soldier in the satire of filmmaking. The film also stars Jack Black and Ben Stiller, who co-wrote, directed and produced it.

"If it's done right, it could be the type of role you called Peter Sellers to do 35 years ago," Downey told Entertainment Weekly magazine. "If you don't do it right, we're going to hell."

Stiller said he was "trying to push it as far as you can within reality," with the intent of satirizing over-the-top actors, not African-Americans.

"I had no idea how people would respond to it," Stiller told the magazine. But at a recent screening, black viewers liked the film, he said.

Downeyexplained that he kept the character from becoming a caricature because he "dove in with both feet."

Paramount is set to release "Tropic Thunder" Aug. 15.