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When Stephen Hawking visits Caltech to give a lecture, Sheldon goes to great lengths for a chance to meet his hero in person.
When Professor Proton seeks advice from Leonard, Sheldon is hurt and contacts Bill Nye. Howard interrupts Raj’s girls night out.
In the Season 7 finale, Sheldon gets caught up in all the life-altering changes going on around him and considers a monumental move.
Leonard finds himself drawn towards a comely comic book illustrator. Meanwhile, Sheldon tries to scare the gang for Halloween.
As Howard awaits blast-off, he recounts how the gang threw together a last-minute wedding for him and Bernadette.
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
A bachelor party and his sexual past puts Howard's marriage to Bernadette in jeopardy.
Raj and Howard try to figure out Sheldon's secret daily afternoon routine. Meanwhile, jealousy takes over Leonard and Penny's relationship.
Sheldon once again has to keep a secret when he learns Leonard and Penny are going to break up. Howard keeps getting teased by his fellow astronauts in space.
Sheldon finds himself jealous when Amy goes on a date with Stuart. The other guys can't resist the allure of the latest collectable card game expansion pack.
Leonard asks Penny out on an impromptu romantic date.
Wolowitz is caught in an argument between Bernadette and his mom, even while he's in space. Meanwhile, with his friends on dates, Raj feels lonely.
Penny finds the perfect girl for Raj to date. Meanwhile, Sheldon uses Dungeons & Dragons dice to make life's trivial decisions.
Penny's flirtatious sales pitch is misunderstood by a doctor-client, while Bernadette and Amy debate whether female scientists ought to play the sexuality card.
Sheldon is aghast to learn the new chair in Penny's apartment was someone else's garbage. Leonard and Priya try a long-distance relationship.
Sheldon faces a crisis of conscience after breaking a Star Trek toy given to him by Penny. Meanwhile, a lonesome Raj is smitten after a date set up by his parents.
When it is revealed that Penny and Bernadette went wedding dress shopping without her, Amy becomes heartbroken and pressures Sheldon for sex.
Sheldon incurs Amy's ire when he chooses a weekend of videogaming with the guys over a birthday party for her aunt.
Sheldon is miffed that Leonard plans to attend a party hosted by his nemesis, Wil Wheaton. Meanwhile, Howard is offered a chance to be a payload specialist on the International Space Station.
After spending the night with Raj, Penny is worried that her friendship with the guys is in jeopardy, while Sheldon becomes the paintball team leader.
Sheldon is ordered to teach a class, and the gang is surprised when Howard signs up to take it; and tensions between Penny and Bernadette afford Amy an opportunity to play one against the other.
Leonard and Penny create lists of 'bugs' in their relationship in an attempt to strengthen it. Meanwhile, Sheldon and Amy create a YouTube video series called Fun with Flags, and Raj develops an unhealthy attachment to Siri on his iPhone.
When his mother comes for another visit, Sheldon is disappointed that she's stopped being the mother he wants her to be.
Sheldon finds himself in hot water when he doesn't appreciate Amy's recent accomplishment. Howard discovers Bernadette doesn't interact well with children.
Sheldon is forced into altering his precious schedule after his barber falls ill. Meanwhile, the training required to be an astronaut has Wolowitz wondering if he has the right stuff.
When the University reassigns Sheldon's parking spot to Wolowitz, their fight affects the whole gang.
Leonard can't take Sheldon's continued selfishness and agrees to dissolve the Roommate Agreement. Howard wants to have a cool nickname for when he's an astronaut.
When a new office space is made available, Sheldon goes head to head with his nemesis, Kripke, for the right to move in. Meanwhile, Penny is unsettled by painting given to her by Amy.
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.
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.
Forced to use his vacation time, Sheldon dabbles in biology in Amy's lab. Bernadette reveals to the girls that her father wants her to make Howard sign a pre-nup.
Leonard is hesitant when a bully from high school wants to meet for a drink. Meanwhile, Penny comes to realize she was a bully herself.
A nervous Wolowitz is thrown for a loop when NASA asks him to toss out the first pitch at a Los Angeles Angels baseball game. Meanwhile, Sheldon brags that he and Amy are a better couple than Leonard and Penny, so they set out to prove he's way off base.