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

Given that St. Valentine was a 3rd century Roman priest who was stoned and beheaded, wouldn't a more appropriate celebration of the evening be taking one's steady gal to witness a brutal murder?

Sheldon

Sheldon: Why do you have the Chinese character for "soup" tattooed on your right buttock?
Penny: It's not "soup," it's "courage."
Sheldon: No it isn't. But I suppose it does take courage to demonstrate that kind of commitment to soup.
Penny: How'd you see it? You said you wouldn't look.
Sheldon: Sorry. As I told you, the hero always peeks.