After delivering a decade of memorable, off-the-wall performances in independent films like "Box of Moonlight" (1996) and "Lawn Dogs" (1997), actor Sam Rockwell's supporting role as an unrepentant killer in "The Green Mile" (2000) finally made him known to mainstream audiences. But it was his loopy turn as game show host-turned-CIA agent Chuck Barris in the fantastical biopic "Confessions of a Dangerous Mind" (2002) that completed his successful crossover from indie film mainstay. From there, Rockwell ambulated easily between both worlds, co-starring opposite Nicholas Cage in the zany crime thriller "Matchstick Men" (2005), playing the two-headed, three-armed President of the Galaxy in the long-awaited "Hitchhiker's Guide to the Galaxy" (2005) and shining as an estranged husband reconnecting with his wife in the little-seen Sundance hit "Snow Angels" (2007). He turned to historical portrayals in both "The Assassination of Jesse James by the Coward Robert Ford" (2007) and "Frost/Nixon" (2008), and played a sex addict in "Choke" (2008). Rockwell was adept at transforming both his appearance and demeanor to inhabit a wide range of roles, as he did playing a lone astronaut in "Moon" (2009), Tony Stark's incompetent rival in "Iron Man 2" (2010) and a timid saloon owner in "Cowboys & Aliens" (2011). Regardless of the movie, Rockwell's chameleon-like ability to portray just about any character was always in demand.