Tom Clancy's Splinter Cell: Double Agent is the name of two action-adventure stealth video games, developed and published by Ubisoft. The series, endorsed by American author Tom Clancy, follows the character Sam Fisher, an agent employed by a black-ops division of the National Security Agency, dubbed Third Echelon. Double Agent was released for the GameCube, PlayStation 2, Xbox and Xbox 360 in October 2006. The Wii and Microsoft Windows versions were released in November 2006. A PlayStation 3 version was released in March 2007. Originally the game was set for a March 2006 release, but Ubisoft moved the release date to October 2006 in order to have more development time. Ubisoft then released their fiscal quarter results for Q1 2006 and announced that Double Agent would be put back at least one month in order to boost Q3 2006 income.
There are two separate versions of Double Agent. One version was made by Ubisoft Milan and Ubisoft Shanghai, developers of Tom Clancy's Splinter Cell: Pandora Tomorrow and was released on the Xbox 360, Microsoft Windows, and PlayStation 3. The other version was made by Ubisoft Montreal (Tom Clancy's Splinter Cell and Tom Clancy's Splinter Cell: Chaos Theory) and was released for the Xbox, PlayStation 2, Nintendo GameCube and Wii. The Ubisoft Shanghai version features a completely custom engine while the Ubisoft Montreal version plays more like the classic Splinter Cell games. The games share the same general plot but feature different storylines, plot twists, and levels. They do however, share the same background music, a few cut scenes and all voice actors. The version for mobile phones was developed by Gameloft.