Variety is reporting that Justin Theroux has been tapped by Marvel Studios to write the screenplay for "Iron Man 2." Theroux, an actor known for his work on HBO’s "Six Feet Under," recently wrote the screenplay for the upcoming comedy "Tropic Thunder."

Marvel is currently is negotiations with star Robert Downey, Jr. and director Jon Favreau to return to the sequel. The studio plans to release "Iron Man 2″ in April of 2010.

"Iron Man," released in May, has earned more than $314 million at the domestic box office and collected another $252 million overseas.