‘Big Bang Theory’
How will Leonard (Johnny Galecki) make it up to Penny (Kaley Cuoco) in “The Big Bang Theory” Season 10, episode 13? CBS

Penny (Kaley Cuoco) and Leonard (Johnny Galecki) will go through a rough patch in their marriage in an upcoming episode of “Big Bang Theory” Season 10.

In “The Romance Recalibration,” Penny thinks that her husband has been taking her for granted. As a result, Penny will invite Amy (Mayim Bialik) to go on a spa date with her. The two female characters bond and share stories about Leonard and Sheldon (Jim Parsons). However, it seems that Leonard will be affected by what Penny thinks of him that he will step up his game and prove that he loves her deeply.

Meanwhile, other than Penny and Leonard’s issues, Raj (Kunal Nayyar) will also be involved in drama in the upcoming episodes. While speaking with TV Line, showrunner Steve Molaro confirmed that Raj’s ex-girlfriend, Emily (Laura Spencer), will be returning to the hit CBS sitcom. To make her return more interesting, Emily will also be reuniting with Raj’s other ex-girlfriend, Claire (Alessandra Torresani). “They are temporarily done, but we are talking about an idea that would involve both of them,” he said.

In “The Hot Tub Contamination,” Raj told Stuart (Kevin Sussman) that he already ended his relationship with both Emily and Claire. At the time, Stuart asked Raj what his best date night was like, and he joked about having the most fun with Stuart while they are in a bathtub drinking wine.

“Big Bang Theory” Season 10 will return with episode 12 after a short Christmas break. “The Holiday Summation” will feature the return of Sheldon’s mom, Mary Cooper (Laurie Metcalf). Sheldon and Amy will visit her in Texas to inform her that they have moved in together.

“Big Bang Theory” Season 10, episode 12 will air on CBS on Jan. 5. Episode 13 will air on Jan. 12 at 8 p.m. EST.