Throughout 42 seasons of television and 13 movies, many familiar faces have populated the universe of "Star Trek," which just might be the greatest sci-fi franchise of all time. If you forgot that any of these performers made "Star Trek” appearances, you'd be easily forgiven — there's an awful lot of "Trek" out there to sink your teeth into. As such, we've assembled a list of celebrities that you likely never knew made appearances in "Star Trek", whether it was a bit part in one of the TV shows or a role in a movie before they became more famous. Nevertheless, there are some mind-blowing celebrities who have gone to warp speed in "Star Trek." Here are a bunch of celebrities you didn't know were in "Star Trek."