Robert Downey Jr. David Fincher's mystery thriller "Zodiac", which was based on a true story. He played the role of "San Francisco Chronicle" journalist Paul Avery, who was reporting the Zodiac Killer case. With all of the critical success Downey had experienced throughout his career, he had not appeared in a "blockbuster" film. That changed in 2008, when Downey starred in two critically and commercially successful films, "Iron Man" and "Tropic Thunder". In the article Ben Stiller wrote for Downey's entry in the 2008 edition of "The Time 100", he offered an observation on Downey's commercially successful summer at the box office: In
Iron Man (2008 film) the star, the superhero is the star. The success of "X-Men" and "Spider-Man" without being star-driven pieces reassures [executives] that the film does have an upside commercially." However, in September 2006, Robert Downey, Jr. was cast in the role. Favreau chose Downey, a fan of the comic, because he felt the actor's past made him an appropriate choice for the part, explaining "The best and worst moments of Robert's life have been in the public eye. He had to find an inner balance to overcome obstacles that went far beyond his career. That's Tony Stark." Favreau faced opposition from Marvel