Buzz Aldrin as Stargazer
You know him as: being a fucking astronaut, punching a reporter in the face
Aldrin is the absolute perfect candidate for a voice acting role in Mass Effect, however brief that role is. Like Shepard, he has a penchant for punching uppity journalists in their stupid faces. And while he may only appear at the game's controversial ending, Buzz is the only celebrity on this list who's actually been to space. We know, right? Fucking nerd.