The surprise cameo in the May 6 finale follows appearances by 'Big Bang Theory' alums Mayim Bialik and Kunal Nayyar in previous episodes

A lot of times when you hear the word 'reboot,' you sort of cringe like, 'Oh, gosh, don't mess up that show that I love so much. Every decision that we made was very much keeping in mind that we had to pay respects to the original and just build on the foundation that they set for us.

As the comedy awaits a renewal, what does this major plot twist mean for its future? Plus, Rauch opens up about having more 'Big Bang Theory' stars back on set.