The Olson twins, one klingon, one romulan. Let them play off against each other.
Romulan's are fairly slim, let the druggy twin be Romulan.
Aaron McGuire wrote:
As for my pick for an alien: James Marsters as a Romulan. I think he'd be brilliant. He had auditioned for the part of Shinzon in Nemesis and I think he would've been a better choice.
James Marsters doesn't look anything like a young Patrick Steward. But that it seems wasn't one of the qualifications for the role.