17 Extra Special Guests Who Appeared on The Big Bang Theory

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One of things that makes The Big Bang Theory such a fun show is its occasional special guest appearance.

There have been several memorable cameos throughout the show's eight seasons, including famous scientists and beloved actors.

Some have appeared to play other characters, but the moments we love most are the ones where the gang completely geeks out over an actor or has an inappropriate response to a renowned scientist.

So, here they are: our list of 17 special guests who appeared as themselves and had some... interesting interactions with Sheldon, Leonard, and the rest of the group.

Yes, many of these come from Star Trek, but you're not surprised about that, are you? Rest in peace, Leonard Nimoy.

If you've missed any of these wonderful appearances, you can watch The Big Bang Theory online to see who you can catch. 

Up next is The Big Bang Theory Season Season 8 Episode 17, "The Colonization Application." Be here shortly afterward for a full review of all the fun!

Ashley Bissette Sumerel was a staff writer for TV Fanatic. She retired in September 2017. Follow her on Twitter and on Google+.

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TBBT Quotes

What do Sheldon Cooper and the black hole have in common? They both suck.

Professor Hawking

Amy: Sheldon, there's something else I've been wanting to say, but before I do, I just... I want you to know that you don't have to say it back.I know you're not ready, and I don't want you to say it just because social convention dictates...
Sheldon: I love you, too.
Amy: You said it.
Sheldon: There's no denying I have feelings for you that can't be explained in any other way. I briefly considered that I had a brain parasite. But that seems even more far-fetched. The only conclusion was love.