Sledgehammer Games
Sledgehammer Games began to work on a  Call of Duty third-person shooter in 2009, which would have changed the series dramatically: they planned to turn it into an adventure game. But when Jason West and Vince Zampella, and many other employees from left Infinity Ward in spring 2010, Activision stopped the developement of that new game. Instead, they asked Sledgehammer Games to work with Infinity Ward to develop Call of Duty: Modern Warfare 3 together. Sledgehammer Games had spent six months working on the Call of Duty third-person shooter before they began working with Infinity Ward. In October 2011, Sledgehammer Games have said that they will likely cancel the third-person shooter development, but will maybe continue developing in the future.