Leonard and Penny are set to be driven crazy by Sheldon's attempts to recall the name of the song, which was stuck in his head, in "Big Bang Theory" season 9 episode 10.

"Big Bang Theory" season 9 episode 10 is entitled "The Earworm Reverberation." According to Spoilers Guide, the episode will see Sheldon inform everyone that he realized why a song had been stuck in his memory.

Episode 10 will also see Amy invite Dave for dinner, even though their previous date ended up awkward. In addition, Wolowitz and Koothrappali are set to become obsessed with a fan of their band, "Footprints on the Moon," in the episode.

Meanwhile, "Malcolm in the Middle" actress Jane Kaczmarek is also set to guest star in "Big Bang Theory" season 9 episode 12, which is entitled "The Sales Call Sublimation," according to CBS. Kaczmarek will play the role of Dr. Sarita Gallo, a psychiatrist Leonard meets when penny, who is a pharmaceutical representative, makes a sales call.

Aside from Linwood Boomer's comedy series "Malcolm in the Middle," Kaczmarek is also known for her roles in Ulu Grosbard's drama romance film "Falling in Love," Brian Gilbert's fantasy comedy "Vice Versa," and Gary Ross' comedy drama "Pleasantville." The actress is also set to appear in Dax Shepard's action comedy "CHiPs," John Leonetti's horror thriller "The Wolves at the Door," and Arnold Grossman's drama "The Boat Builder."

"Big Bang Theory" season 9 episode 10, "The Earworm Reverberation," is set to air on CBS on Dec. 10 while episode 12, "The Sales Call Sublimation," airs in televisions in 2016.