A game created by Bioware
This RPG(role playing game) is one of the best games for you 360
The Main plot line is Your Commander Shepard your past depending how player you could a war hero or a survivor of a mission gone bad. Choosing how you look and what gender gives the player the freedom to choose who they seem fit to be the lead character.
Humanity have many colonies in space and they have been invited by aliens to take a bigger role in shaping the galaxies. But not is all well many humans don't like aliens and vice versa. its up to Commander Shepard to change minds of his fellow humans and new alien allies and stop a ancient evil force killing everyone
Commander Shepard has many options to choose from during a fire fight or even talking with people. He could be your best friend or your worst enemy in Mass effect