Mass Effect:
You take on the role of Commander Shepard of the starship Normandy, the last hope for all life in the Galaxy. Saren, a rogue member of the elite and untouchable Spectre agents, has discovered the secret to unleashing an apocalyptic force upon the galaxy, and only you stand in his way. To save the lives of billions, you must do whatever it takes to stop Saren and prevent the return of an ancient force bent on the destruction of all organic life.

Mass Effect 2 Digital Deluxe Edition:
Two years after Commander Shepard repelled invading Reapers bent on the destruction of organic life, a mysterious new enemy has emerged. On the fringes of known space, something is silently abducting entire human colonies. Now Shepard must work with Cerberus, a ruthless organization devoted to human survival at any cost, to stop the most terrifying threat mankind has ever faced.

To even attempt this perilous mission, Shepard must assemble the galaxy's most elite team and command the most powerful ship ever built. Even then, they say it would be suicide. Commander Shepard intends to prove them wrong

• Mass Effect
  • Experience a rich and engrossing story where your choices decide the fate of a galaxy
  • Engage in emotionally charged interactions with the most realistic digital actors ever seen in a video game, using an innovative new dialog system
  • Immerse yourself in an incredible new adventure from world-famous masters of the RPG; BioWare
  • Stunning high resolution graphics for PC
  • Optimized GUI and controls for PC gamers
  • Dominate the battlefield with new individual squad member command system
• Mass Effect 2
  • Mankind’s Future is At Stake
    • From the makers of Star Wars®: Knights of the Old Republic™, Dragon Age: Origins™, and Mass Effect™ comes the dark second installment in the thrilling Mass Effect Trilogy!
    • Command a unique team of amazing characters on a perilous mission in the most dangerous regions of space.
    • Players of the first Mass Effect can import save games to continue the story of their own Commander Shepard. New players will find a thrilling stand-alone adventure awaits them, a polished and action packed journey that surpasses the first game in nearly every possible way.
  • Intense Third Person Combat
    • Take cover, command an elite squad with ease, utilize 19 weapon classes including heavy weapons, and unleash deadly powers against your foes with an all new and improved combat system.
    • Increased intensity with precision shooter controls to let you control the action and overcome insurmountable odds.
    • Featuring a new location based damage system: target key weak points, and blast off limbs, ignite enemies, or cripple and disable enemy troops.
  • An Entire Galaxy to Explore
    • Travel the distant and deadly reaches of space to assemble your team for the mission at hand. A cast of amazing characters await discovery on a variety of dangerous, visually stunning worlds
    • Survey unique planets and embark on side missions to uncover more secrets in the Mass
      Effect universe.  Robust Character Customization
    • Choose a player class, customize your appearance, and tailor your own abilities and
      strengths. As you progress, so do Shepard’s abilities.
    • Control the conversation. Improved conversation system where you can take matters into your own hands – often with the liberal application of force.