Awesome Mass Effect Secrets You Probably Didn’t Know

The Voice of the Catalyst is both Male and Female Shepard

If you manage to listen very, very closely, the voice of the Catalyst contains both the voice actors for male and female Shepard. While the Catalyst speaks, the voices of male and female Shepard can be heard echoing its dialogue and it is quite awesome that the developers decided to integrate that into the game, because it is some sort of epic foreshadowing, especially if Shepard makes the choice of controlling the Reapers.