Call of Duty is an award winning first-person shooter video game series franchise. The series began on the PC, and later expanded to consoles and handhelds, and several spin-off games have also been released alongside the main series. The majority of the games in the series have been set in World War II, with the exception of Call of Duty 4: Modern Warfare and Modern Warfare 2, which are set in modern times.

The Call of Duty video games are published by Activision and Aspyr Media and have been developed primarily by Infinity Ward, with other games being developed by Treyarch, Gray Matter Interactive, Spark Unlimited, Pi Studios, Amaze Entertainment, and Rebellion Developments, using a variety of game engines including the „id Tech 3“ and the „Treyarch NGL.“ Other products in the franchise include a line of action figures designed by Plan-B Toys and a card game created by Upper Deck.

Call of Duty is a first-person shooter video game based on the Quake III Arena engine (id Tech 3), and was released on October 29, 2003. The game was developed by Infinity Ward and published by Activision. The game simulates the infantry and combined arms warfare of World War II.[1] Call of Duty was accompanied in September 2004 by an expansion pack, Call of Duty: United Offensive, which was also produced by Activision, but developed by Gray Matter Interactive with contributions from Pi Studios. The Mac OS X version of the game was ported by Aspyr Media. In late 2004, the N-Gage version was developed by Nokia and published by Activision. Other versions were released for PC, including Collector’s Edition (with soundtrack and strategy guide), Game of the Year Edition (includes game updates), and the Deluxe Edition (which contains the United Offensive expansion and soundtrack; in Europe the soundtrack was not included). Since November 12, 2007, Call of Duty and its sequels have been available for purchase via Valve’s content delivery platform, Steam.[2]

Call of Duty: United Offensive is an expansion pack for the popular first-person shooter computer game, Call of Duty and is set chiefly at Bastogne, Belgium, during the Battle of the Bulge. The game was developed by Gray Matter Interactive, with contributions from Pi Studios, and published by Activision. It was released for Microsoft Windows on September 14, 2004.

Call of Duty 2 is a first-person shooter video game and sequel to the critically acclaimed game Call of Duty. It was developed by Infinity Ward and published by Activision. The game is set during World War II and is experienced through the perspectives of three soldiers in the Red Army, British Army and United States Army. It was released on October 25, 2005 for PC, June 13, 2006 for Mac OS X and November 15, 2005 for the Xbox 360. Other versions were made for mobile phones, Pocket PCs, and Smartphones.

Call of Duty 3 is a World War II first-person shooter and the third installment in the Call of Duty video game series. The game was developed by Treyarch, and was the first major installment in the Call of Duty series not to be developed by Infinity Ward. It was released on the PlayStation 2, PlayStation 3, Wii, Xbox, and Xbox 360. Call of Duty 3 is the only numerical sequel to date to have been a console-exclusive game alongside its side-story games like Call of Duty 2: Big Red One and Call of Duty: Finest Hour before it. It was released on November 7, 2006.

Call of Duty 4: Modern Warfare is the fourth installment of the main series, and was developed by Infinity Ward. It is the first game in the series not to be set during World War II, as well as the first to receive a Mature rating from the ESRB (except for the Nintendo DS version, which was rated Teen). The game was released for Microsoft Windows, Nintendo DS, PlayStation 3, and Xbox 360 on November 7, 2007. Download and retail versions for the Mac OS X were released by Aspyr in September 2008. As of June 2008, Call of Duty 4: Modern Warfare has sold over 10 million copies, making it the most successful game in the series.

Call of Duty: World at War developed by Treyarch is the fifth installment of the main series, and returns to the World War II setting of earlier titles. On June 9, 2008, it was confirmed that the game would be titled Call of Duty: World at War and would be set in the Pacific theater and Eastern front of World War II. The game uses the same proprietary game engine as Call of Duty 4. Call of Duty: World at War was released for the PC, PS3, Wii, Xbox 360 consoles and the Nintendo DS handheld in North America on November 11, 2008, and November 14, 2008 in Europe.

Modern Warfare 2 formerly Call of Duty: Modern Warfare 2) is under development by Infinity Ward and will be published by Activision. Activision Blizzard officially announced Modern Warfare 2 on February 11, 2009, and a release date was later set for November 10, 2009. No other information about the game has been revealed.

Call of Duty 7 (working title) was leaked as being in production when David Kim, a senior animator at Treyarch said „I am currently on my second title as a senior animator in the games industry with Activision / Treyarch on Call Of Duty 7.“

Sources: Wikipedia Modified by Fanterazzi