"Mass Effect 2" establishes that EDI's highly advanced nature is a result of modifications achieved with technology salvaged from the Reaper Sovereign. She is initially "shackled" with programming which inhibits her decision making, until it was later removed by Joker. In "Mass Effect 3", Shepard's team recovers a Cerberus infiltration unit named Eva to be analyzed after an incident at the Mars research station. EDI assists in doing so, and in the process, struggles with the synthetic entity and eventually seizes control of its platform in the process, allowing her to accompany Shepard as a squad mate on missions. Now possessing a physical body with humanlike characteristics, her relationship with Joker develops further, and, if Shepard supports the idea, the two may start a romantic relationship. She also will converse with Shepard several times, asking them about human behaviors so that she can better understand human psychology and, in a sense, taking on more human traits herself. During the Alliance raid on Cerberus Headquarters, a Cerberus report discovered in the base reveals EDI's original identity as a rogue VI featured in an optional mission of the first "Mass Effect" game, in which she somehow achieved sentience and took over an Alliance training ground located on Earth's moon. If Shepard chooses to control the Reapers or the synthesis of all organic and synthetic life at the conclusion of the game, EDI will be present in the ending cutscene alongside Joker.