You keep seeing the same faces over and over again in science fiction. At first it's like, "Oh, there's my old friend Summer Glau. I'm so glad she's getting work." And then, it slowly turns into, "How many maniacs of science can Jeffrey Combs play before he actually falls asleep in mid-speech and lights his hair on fire with his bunsen burner?" Especially when people like Will Smith admit they're only doing scifi because it's commercial. Click through to vote for the most overexposed science fiction actor.
I resisted the temptation to include people like Katee Sackhoff, who's only done two shows: Battlestar Galactica and Bionic Woman. Or Scott Bakula. Or half the cast of Firefly, who've gone on to be on other things. I also decided to leave out Bruce Willis and Cilian Murphy, who have been in a lot of scifi but aren't really "scifi actors" in the way that Will Smith is. Who would you have included on this poll?
In any case, you needn't feel guilty about voting for a good actor in this poll. Everyone here is a good actor, but maybe one of these people should work in other genres for a while. (Which, to be fair, Smith did for a bit.)