• "The Big Bang Theory" stars Kunal Nayyar, Simon Helberg, Jim Parsons, Johnny Galecki, Melissa Rauch and Kaley Cuoco are on stage during the 23rd annual A Night at Sardi's.

"The Big Bang Theory" stars Kunal Nayyar, Simon Helberg, Jim Parsons, Johnny Galecki, Melissa Rauch and Kaley Cuoco are on stage during the 23rd annual A Night at Sardi's. (Photo : Reuters/Mario Anzuoni)

In "The Big Bang Theory" season 9 episode 2 titled "The Separation Oscillation," Leonard (Johnny Galecki) is set to confront a woman from his past to appease Penny (Kaley Cuoco) while it is revealed that Bernadette (Melissa Rauch) is keeping a secret from Penny.

In the past, Leonard kissed a woman on the North Sea. He decides to finally confront that woman just to set Penny's mind at ease. It turns out that Leonard is not the only one who feels guilty. Bernadette is also feeling guilty because he has been withholding a secret from Penny.

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Meanwhile, Sheldon (Jim Parsons) deals with his breakup with Amy (Mayim Bialik) by filming a special episode of "Fun With Flags." In "Big Bang Theory" season 9 premiere, he did not know what to do after Amy pushed pause on their relationship.

With Galecki, Cuoco, Rauch, Parsons and Bialik, "The Big Bang Theory" also stars Simon Helberg and Kunal Nayyar, who is set to talk about his career at the 2015-16 Speaker Series at Penn State Behrend in Erie, Penn., on Oct. 8, according to Titusville Herald.

The author of the new memoir "Yes, My Accent Is Real: And Some Other Things I Haven't Told You" will also have a presentation titled "From New Delhi to Hollywood: Navigating Life Through Humility," which is free and open to the public, in Junker Center. 

Nayyar also recently invested in a new photo app called Shoto in partnership with the leading source of seed stage capital in Canada called Real Ventures, Economic Times reported.