These supporting Big Bang Theory characters practically stole the show. For this list, well be looking at the best characters that were not part of the core cast on this definitive sitcom. Our countdown includes Mary Cooper, Bert Kibbler, Wil Wheaton, and more! Whos YOUR favorite TBBT supporting character? Let us know in the comments!

Watch more great TBBT videos here:
The Most Rewatched Big Bang Theory Moment of Every Season - https://youtu.be/efNeBnlUEYo
Top 10 Most Romantic The Big Bang Theory Moments - https://youtu.be/J6hRnb0p2wo
Top 10 Penny & Sheldon Moments on The Big Bang Theory - https://youtu.be/UxdAW0Oyl5I

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