Mass Effect 3′s E3 demo began with a brief overview of the franchise’s story line, features, and history. Mass Effect 3 combat developer Corey Gasper then shows off Commander Shepard attacking a Reaper base. After dispatching some Reaper sentries, Reapers pop out all over the place trying to blast Shepard. He keeps going forward to try to destroy the base. The human attack ship, The Normandy, locks in to the Reaper base and drops bombs.