Commander Shepard and his crew are tasked with stopping the rogue operative Saren Arterius from leading an army of sentient machines to conquer the galaxy. During his pursuit, Shepard learns of a far greater threat: the Reapers. A mysterious, powerful ancient race intent on returning from dark space to purge all advanced sentient life from the Milky Way, a cycle they have repeated every 50,000 years.
Shepard must find a way to prove the threat is real, and unite all of galactic civilization in a fight for their collective survival.
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