As the first human Specter – sworn defenders of galactic peace – your mission is to halt the advancing armies of a legendary agent gone rogue. But as you lead your elite team across hostile alien worlds, you will discover the true threat is far greater than anyone imagined.

Three hundred years ago the quarians created the geth, a species of rudimentary AIs, to serve as an efficient source of manual labor. But the geth rebelled against their quarian masters and drove them into exile. Now the quarians wander the galaxy in a flotilla of salvaged ships, secondhand vessels, and recycled technology. Other species tend to look down on the quarians, seeing them as scavengers and condemning them for unleashing a dangerous synthetic life form on the rest of the galaxy.

Urdnot Wrex is one of the last krogan Battle Masters: rare individuals that combine powerful biotic abilities with the devastating firepower of advanced weaponry. Born into clan Urdnot, he quickly gained fame for his prowess in battle. He became a leader of one of the smaller Urdnot tribes while still a youth: the youngest krogan to be granted the honor in 1000 years… until he was betrayed by his own people.

The betrayal opened Wrex’s eyes to the truth about the krogan: most would rather die in battle than try to rebuild their society through peaceful means. Realizing the warrior culture that once valued courage, strength and honor had been reduced to glorifying pointless violence Wrex turned his back on the rest of the krogan.

Over the past three centuries he has served no master but himself, working as a bodyguard, mercenary, soldier of fortune and bounty hunter; there is little in the galaxy that can still surprise him. He doesn’t speak often, but when he does his words are direct and often shockingly blunt - and people tend to listen.

Despite his brutish appearance, Wrex rarely loses his temper; the mere threat of his anger is usually enough to get what he wants. When his fury is unleashed, however, it is a truly terrifying sight.

Features :

• Immersive RPG: Determine the fate of mankind as you lead an elite tactical strike force as an epic galaxy-wide conflict unfolds. "Mass Effect" will take the player into new depths of an action-roleplaying game, with choice-based gameplay.
• Rich and engaging storyline. While defending galactic peace and earning a position of respect for humanity in the community, gamers will discover that a greater conflict between organic life and artificial intelligence exists. Players' decisions and actions will serve to shape the destiny of all life in the galaxy as you become absorbed in the story that is "Mass Effect," the first game in an epic trilogy from BioWare. They will become the center of an engrossing story as they battle against alien life forms to save the galaxy from threatening armies.
• Player controls the ultimate fate of the galaxy: The player's decisions and actions will serve to shape the destiny of all life in the galaxy, while raising humanity to the pinnacle of galactic civilization via noble means or via tyranny.
• Real-time squad based combat: "Mass Effect" employs a real-time, squad based, tactical combat system. Players will be immersed in intense, challenging and exciting combat.
• Explore uncharted worlds: In addition to the main story arc of the game, players will be able to visit a large number of uncharted, unexplored planets which are not directly tied to the main story. At any time during the campaign, a player can choose to explore one of these planets in an all-terrain rover in order to discover new alien life, resources, ruined civilizations and powerful technologies.
• Digital actors: "Mass Effect" features a huge cast of in-engine digital actors that you will encounter as NPCs, enemies or as party members. Each will have life-like facial and body movements, and an advanced dialogue system will give them engaging personalities.
• Character customization. Players will be able to choose from a variety of stunning, photo-realistic character appearances at the start of the game, and throughout the game can increase various statistics which will have an impact on their performance during gameplay. Equipment, weapons and armor that are acquired during the course of the story will change the appearance of the characters.
• Next-generation gaming defined. "Mass Effect" takes advantage of Xbox 360's hardware providing gamers with exciting new experiences, including photo-realistic, high definition graphics on an epic scale. As the future of gaming goes online, Xbox360 live features, including premium downloadable content and recognition of achievement will be available via the Xbox Live service.