Raj is concerned over whether a probe he designed will work in outer space. Penny and Amy coerce Leonard and Sheldon into taking them shopping.
Amy fixes a traditional Victorian Era Christmas Eve dinner whose guest list includes Raj’s newly separated father, visiting from India.
Sheldon retires his Fun With Flags You Tube series, while Leonard, Howard, and Raj look through the papers of a deceased colleague and Bernadette discovers what her boss really thinks of her
Sheldon panics when Leonard goes into the hospital for an operation. Meanwhile, Raj learns that his parents have gotten a divorce.
Amy, Bernadette, and Penny decide to re-enact their high school proms with their respective fellows. Raj, Emily, and Stuart are included too.
At her new job, Penny has a client who develops a crush on her. It turns out that he is a middle-aged version of Howard Wolowitz.
Penny receives a company car from the pharmaceutical company where she’s now employed but has trouble coming up with the money to pay back Leonard for the one he bought for her. Meanwhile, Sheldon and Raj look at a potential research grant.
During their weekend in Las Vegas, Bernadette and Amy accuse Penny of being a buzz kill.
Raj’s honesty about his past comes back to haunt him after his girlfriend, Emily, is cold to Penny. Also, the guys consider becoming part-owners in Stuart’s comic book store.
Wolowitz is nervous after NASA asks him to throw out the first pitch at a Los Angeles Angels game. Also, Leonard and Penny try to prove Sheldon wrong after he says that he and Amy are a â€œsuperior coupleâ€.
Episode 1 – The Locomotion Interruption: Leonard and Amy take an unexpected road trip to Arizona to pick up Sheldon. Meanwhile, Penny interviews for a job at Bernadetteâ€™s company and Howard is weirded out by Stuartâ€™s relationship with Mrs. Wolowitz. Episode 2 – The Junior Professor Solution: When Sheldon is forced to teach a class,
Sheldon is forced to confront an uncertain future and considers a major move. Meanwhile, Raj and Emily take it to the next level, and Mrs. Wolowitz’s injury is a major headache for Howard and Bernadette.
A bad day causes Penny to reevaluate her life choices – including Leonard. Meanwhile, Howard and Bernadette struggle to care for Mrs. Wolowitz, and Raj gets relationship advice from Sheldon.
As the gang celebrates Star Wars Day, Sheldon discovers he is having difficulty dealing with the death of Professor Proton.
To prepare for a date with Emily, Howard acclimates Raj to horror movies. Penny and Sheldon are upset when they discover Amy and Bernadette lied to avoid hanging out with them.