The Grey is a 2011 survival film co-written, produced and directed by Joe Carnahan and starring Liam Neeson, Frank Grillo, Dallas Roberts, Joe Anderson, Nonso Anozie, and Dermot Mulroney. It is based on the short story "Ghost Walker" by Ian MacKenzie Jeffers, who also co-wrote the screenplay with Carnahan. The story follows a number of oil-men stranded in Alaska after a plane crash, who must wage a war against multiple packs of Canadian grey wolves, stalking them during the mercilessly cold weather.