20 Mind-Blowing Facts You Didn't Know About Zodiac (2007)

These days, Hollywood casting agents are champing at the bit to put together a cast of this magnitude. The incredibly talented group have all gone on to have highly successful careers after Zodiac's release and all three have managed to find their way into the biggest movie franchise on the planet.

Robert Downey Jr has pulled off one of the most incredible comeback stories in Hollywood, thanks to his tenure as Tony Stark. Mark Ruffalo has made waves in hard hitting films such as Shutter Island and Foxcatcher when he's not donning the motion capture suit for Marvel. Even Jake Gyllenhaal has come into his own, currently enjoying praise for his incredible work in Spider-Man: Far From Home.

Yet, back when Zodiac was entering production, it took a nudge from Jennifer Aniston for Fincher to consider Ruffalo and Gyllenhaal. Aniston had met Fincher through her then husband, Brad Pitt and the two struck up a conversation about the upcoming film. Having worked with both actors previously, the Friends star pointed the director in their direction and her instinct paid off entirely.