Summary pulled directly from Steam - Some text may only be applicable to Steam platform

As Commander Shepard, you lead an elite squad on a heroic, action-packed adventure throughout the galaxy.

Discover the imminent danger from an ancient threat and battle the traitorous Saren and his deadly army to save civilization. The fate of all life depends on your actions!

• 2007 New York Times Game of the Year
  
• A Stunning universe with high resolution graphics and textures
  
• Controls and interface optimized for PC gamers
  
• Customize your character and embark on a pulse-pounding adventure in an immersive open-ended storyline
  
• Incredible real-time character interaction
  
• Thrilling, tactical combat as you lead an elite squad of three
  
• Interplanetary exploration of an epic proportion