Set 200 years in the future in an epic universe, “Mass Effect” places gamers in a vast galactic community in danger of being conquered by a legendary agent gone rogue. A spectacular new vision from legendary developers BioWare, “Mass Effect” challenges players to lead a squad of freedom fighters as they struggle against threatening armies to restore peace in the land. “Mass Effect” is the first in a trilogy of games with an overarching story, where the real conflict between organic beings and artificial intelligence comes to life in startling clarity.