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.
When Ron hexes the day to prove superstitions aren't real, things at the hospital start getting weird. Joyce and Matt discover an employee's secret.
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.
Judge Abby Stone follows in the footsteps of her late father Harry Stone as she takes over the night shift of a Manhattan arraignment court. When a public defender is needed, Abby sees potential in an unlikely candidate in former prosecutor Dan Fielding.
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.
