Mini poster for the Japanese release of Zodiac.

Zodiac is a 2007 American mystery thriller film directed by David Fincher and written by James Vanderbilt, based on the nonfiction books by Robert Graysmith: Zodiac (1986) and Zodiac Unmasked (2002). It stars Jake Gyllenhaal, Mark Ruffalo, and Robert Downey Jr., with Anthony Edwards, Brian Cox, Elias Koteas, Donal Logue, John Carroll Lynch, Chloë Sevigny, Philip Baker Hall, and Dermot Mulroney in supporting roles.