Mass Effect is a science fiction video game series developed by BioWare. Set in a richly detailed universe, players take on the role of Commander Shepard, who must navigate complex interstellar politics, form alliances, and combat various alien species to save the galaxy from existential threats. The series is known for its deep storytelling, character development, and player choices that significantly impact the narrative. Players can customize their character's abilities and make decisions that affect relationships with companions, such as Garrus Vakarian and Tali'Zorah, as well as the fate of entire civilizations.