"Crackdown is an open world, third-person shooter video game for the Xbox 360. It was released in North America on February 20, 2007, and worldwide by February 23, 2007. Crackdown was developed by Realtime Worlds, and distributed by Microsoft Game Studios. It was conceived by Realtime Worlds' founder, David Jones, who also created Grand Theft Auto and Lemmings.
Wilson and lead designer Billy Thomson had previously confirmed that Crackdown was designed from the outset to be a long running series of games, stating that sequels for the game are very likely to be produced, especially if Crackdown performed well commercially.
Crackdown 2 was released on July 6, 2010, for U.S.A and Canada, and July 9 everywhere else."
Source: Wikipedia, "Crackdown", available under the CC-BY-SA License.