8. Alex Trebek The X Files
Episode Appeared: Jose Chung's From Outer Space (Season 3) This one was a major surprise to me. I had finished watching The X Files and one of my friends mentioned this cameo to me. I thought he was lying, I thought "The guy who hosts Jeopardy? He's not an actor." Turns out, he wasn't lying! Sure enough I went back and found where he was in the series and get this: He doesn't play a character; He plays Alex Trebek. That's right, Alex Trebek plays Alex Trebek in probably one of the cooler cameos I came across. After all, he's moonlighting as one of the "Men In Black." Crazy!