When Sheldon and Amy build a blanket fort, they come to major crossroads in their relationship. Also, Wolowitz meets the half-brother he never knew he had, and when Penny is invited to appear on Wil Wheaton's podcast, she and Leonard have a huge, on-air argument.moreless
As a joke, Sheldon and Penny try an experiment designed to make participants fall in love. Also, Leonard, Amy, Raj and Emily spend the evening trying to escape a room with a "zombie." And, after returning from Mrs. Wolowitz' funeral, Bernadette and Howard run into trouble at the airport.moreless
Amid the excitement of Stuart reopening his comic-book store, Howard gets some unsettling news; and after teaching Sheldon how to "let it go," Penny doesn't practice what she preaches when she learns something maddening about Amy. Meanwhile, Raj and Leonard run into a restaurant customer who looks a lot like actor Nathan Fillion.moreless
Amy and Bernadette organize a prom to be held atop the guys' apartment complex, but Sheldon is leery of all the prom pomp, circumstance and romancing that goes with it.
Sheldon and Raj undertake an underground research expedition that turns into a test of how long before they get under each other's skin. Meanwhile, Leonard and Penny argue about money, and go to Wolowitz and Bernadette for advice.moreless
Raj's brings his new girlfriend over to meet the gang, but she seems standoffish with Penny, who tries to figure out why. Meanwhile, the guys put their heads together to try to re-open Stuart's comic book store.moreless
In the Season 8 premiere, Amy and Leonard take a surprise road trip to Arizona to retrieve Sheldon, while Penny goes on a job interview at Bernadette's company, and Howard has problems wrapping his head around Stuart's relationship with Mrs. Wolowitz.moreless
A trying day at the movie shoot leaves Penny with questions about her life choices, so she decides to act on it; and caring for a bedridden Mrs. Wolowitz proves a challenge for Howard and Bernadette. Meanwhile, Sheldon offers relationship advice to Raj after he sees Emily at the movies with another man.moreless
When the University reassigns Sheldon's parking spot to Wolowitz, their fight affects the whole gang.
Raj and Howard try to figure out Sheldon's secret daily afternoon routine. Meanwhile, jealousy takes over Leonard and Penny's relationship.