Sparing intergalactic civilization from annihilation isn't a new narrative construct -- all budding sci-fi game writers and novelists must have soggy dreams about weaving this sort of epic -- but the foundation isn't exhausted just yet. In 2007, BioWare released the original Mass Effect, a stunning and colorful sci-fi RPG that had you saving intergalactic civilization from destruction -- almost. Its sequel has now arrived, twisting the old foundation into something fresh, inviting, and titillating again.