The Mass Effect game follows Commander Shepard, a soldier who becomes humanity's first Spectre, as he battles against an ancient threat known as Saren Arterius and the Geth. Along the way, Shepard uncovers a larger conspiracy involving the Reapers, powerful machines that threaten the entire galaxy.
The gameplay in Mass Effect is an open-world RPG experience where players control Commander Shepard, completing quests, trading with aliens, and exploring various planets to uncover more information about the Reaper threat. The game features a dynamic conversation system, allowing players to shape the story through their choices.