• 'The Big Bang Theory' stars Simon Helberg, Melissa Rauch, Johnny Galecki, Kaley Cuoco, Jim Parsons and Kunal Nayyar pose at the Hollywood Walk of Fame in Hollywood, California.

'The Big Bang Theory' stars Simon Helberg, Melissa Rauch, Johnny Galecki, Kaley Cuoco, Jim Parsons and Kunal Nayyar pose at the Hollywood Walk of Fame in Hollywood, California. (Photo : Getty Images/Mark Davis)

Fans have to wait for another week before they could finally watch the "The Big Bang Theory" Season 10 episode 13 titled "The Romance Recalibration" on Jan. 19, Thursday. After this week's hiatus, the next episode will air in February.

CBS has not addressed the reasons for the show's short break. However, it seems that it has something to do with the contract negotiations among the "The Big Bang Theory" cast.  

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"We are in negotiations, but it is definitely business as usual," CBS entertainment president Glenn Geller told Variety on Jan. 9, Monday, at the Television Critics Association winter press tour. "We are guardedly optimistic that we will make a deal."

Geller revealed that the three "The Big Bang Theory" cast members that include Jim Parsons, Johnny Galecki and Kaley Cuoco, who play Sheldon, Leonard and Penny respectively, are currently in negotiations for their contracts. The CBS entertainment president expressed his wish to continue the show with the three leads as it is the goal of the network.

Parsons, Galecki and Cuoco are given time to think about the contract negotiation. CBS assured that the three main leads have no deadline that would pressure them to decide on the deal.

Geller failed to comment whether "The Big Bang Theory" would be renewed for more seasons if Parsons, Galecki and Cuoco would agree to the deal. The trio last renewed their contracts in 2014 for three 24-episode seasons, where they received a fee of $1 million per episode.

Season 10, episode 13 will see Penny and Leonard, facing a bit of misunderstanding when the former thinks that the latter is taking her for granted. Penny will invite Amy to the spa instead of Leonard because of her wrong impression. Leonard will ask the help of his friends to make her realize that she is wrong with her thinking.

In an interview with The Hollywood Reporter, showrunner Steve Molaro assured that despite the current issue of contract signing with the "The Big Bang Theory" cast, everything remains business as usual. The approach is taking things script by script by not putting too much arc of the stories.

CBS is also in the works of the "The Big Bang Theory" prequel project Sheldon. Watch an interview of some of the cast members below: