After "Iron Man", Downey appeared alongside Ben Stiller and Jack Black in the Stiller-directed "Tropic Thunder". The three actors play a Hollywood archetype—with Downey playing self-absorbed multi-Oscar-winning Australian method actor Kirk Lazarus—as they star in an extremely expensive Vietnam-era film called "Tropic Thunder". Lazarus undergoes a "controversial skin pigmentation procedure" in order to take on the role of African-American platoon sergeant Lincoln Osiris, which required Downey to wear dark makeup and a wig. Both Stiller and Downey feared Downey's portrayal of the character could become controversial: