Homeworld

Homeworld: Emergence was originally released as "Homeworld: Cataclysm". "Cataclysm" is now a registered trademark of Blizzard Entertainment, Inc., and the game has been renamed to avoid confusion. Other than the subtitle change, the game is identical to the game released in 2000. Homeworld: Emergence is the second game in the Homeworld series. Emergence was originally an expansion pack for Homeworld, but the changes to the game engine and long, detailed single-player campaign (17 missions to Homeworld's 16) prompted the publisher to change it to a stand-alone release.

Homeworld: Raider Retreat is a promotional version of Homeworld that was made available through the pre-order version of Homeworld: Cataclysm. The game added an additional mission, along with the first four missions, focusing primarily on the Turanic Raiders, which was cut from the original game for unknown reasons. None of these missions are available in Homeworld: Cataclysm.