Mass Effect is a science-fiction role-playing action game developed by BioWare for the Xbox 360 and PC. According to BioWare, the game is the first installment of a trilogy concerning the elite soldier Commander Shepard, but Electronic Arts has stated "Mass Effect will be a franchise [for EA] for a very long time".

Mass Effect was released in 2007 on November 20 in USA and Canada, November 22 in Australia and New Zealand, and on November 23 in Europe. It was also released as a Limited Collector's Edition, containing bonus materials including an art book and the Galactic Codex: Essentials Edition 2183 booklet, which gives background on the Mass Effect universe.

The game was later re-made by BioWare and Demiurge Studios for the PC, and the PC-DVD version was released in summer 2008. By summer 2008 there were also versions of the game translated into Spanish, French and Italian. A Japanese-language version is in development for the Xbox 360 only. Mass Effect is available via Xbox's Games on Demand; the full game is available for $19.99.

The game takes place in the year 2183, with the player taking on the role of Commander Shepard, commanding an elite squad aboard a prototype starship, the SSV Normandy. The main story revolves around the quest to find and stop a rogue agent, which then uncovers a plot threatening the entire galaxy.

Within the game universe, the events of Mass Effect are viewed as occurring during the context of the Eden Prime War.

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