7. Seth Green
Best Known For "Austin Powers", "Family Guy"
Appears In "Deep Throat" 1993 In only the X-Files second episode, Mulder and Scully have barely had time to get acquainted before they are called to investigate some mysterious lights near a Southwest Idaho Airbase. Its not long before theyre attempting to break into the airbase, but find out a young Seth Green has beaten them to it Somewhere under that hideous hairdo is Seth Green doing what he does best, playing a stoned 90s grunge teen. He and Mulder strike up a great friendship as only a stoner and FBI Agent can; he gives him food in return for information about the secret experiments they've been performing at the airbase. As for Green, the X-Files would not be the only foray that he would have with the Sci-Fi genre, as he would also appear in Buffy the Vampire Slayer, Weird Science and . . . Seasame Street.