Brian Cox joins Will Ferrell and Zach Galifianakis in Jay Roach's Warner Bros. comedy, Dog Fight.

Will Ferrell and Zach Galifianakis lead as two rival politicians running for a congressional seat in a small North Carolina district election. The actor will play Zach Galifianakis' father, a former Senator who has always been distant toward his family, especially his son.

Jason Sudeikis, Dylan McDermott, Sarah Baker and Katherine LaNasa will be co-staring in the Chris Henchy/Shawn Harwell collaboration.

The comedy has started production this month in New Orleans.