David Theune

When Howard dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny’s Halloween party; Meanwhile, Leonard is shocked that Penny doesn't remember their first kiss.

While Raj is worried that people won’t take him seriously in his own field after publishing a paper suggesting he may have discovered alien life, Penny encourages Leonard to stand up for himself when he wants to be the principal investigator on a plasma physics study.

The game is afoot when Glenn declares that all employees will receive a $200 bonus if the store reaches a certain sales goal by the end of the day. As the associates scramble to upsell their customers, Jonah struggles with his morality until he gives in and convinces a customer to purchase many expensive items...Who happens to be Amy's husband! Meanwhile, a bored Glenn and Dina work together to throw a party for everyone after they meet their sales goals.

Alex tries to hold on to her peaceful vacation vibes. Joyce faces a design crisis in the birthing center. Matt and Serena reassess their working relationship.

When Sheldon is no longer academically challenged at Medford High, he audits a college class taught by a professor (special guest star WALLACE SHAWN).

When a doctor becomes a patient, his co-workers rally around him, whether he likes it or not. Matt and Serena need to talk.