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'The Explosion Implosion' - Season 11, Episode 4 Airs Monday, October 16 at 8/7c on CBS. Wolowitz and Sheldon bond when they drive to the desert to shoot off a model rocket. Also, when Leonard's mom, Beverly, finds a new best friend in Penny, it rubs Leonard the wrong way.

'The Retraction Reaction' - Season 11, Episode 2 Airs Monday, October 2 at 8/7c on CBS. Leonard angers the university - and the entire physics community - after he gives an embarrassing interview. Also, Amy and Bernadette bond over having to hide their success from Sheldon and Howard.

'The Proposal Proposal' - Season 11, Episode 1 Airs Monday, September 25 at 8/7c on CBS. Amy gives Sheldon an answer to his proposal while Howard and Bernadette struggle with some unexpected news, on the 11th season premiere.

'The Property Division Collision' - Season 10, Episode 10 Airs Thursday, December 1 at 8/7c on CBS. Sheldon and Leonard try to divvy up their shared belongings, but can't agree on anything. Also, Koothrappali and Stuart fight to be the most helpful during Bernadette's final weeks of pregnancy.

'The Geology Elevation' - Season 10, Episode 9 Airs Thursday, November 17 at 8/7c on CBS. When Bert, a Caltech geologist, wins the MacArthur Genius fellowship, Sheldon is overcome with jealousy. Also, Wolowitz finds an old remote control Stephen Hawking action figure he invented.

'The Convergence Convergence' - Season 9, Episode 24 Airs Thursday, May 12 at 8/7c on CBS. Chaos ensues when Leonard's recently divorced parents, Alfred (Judd Hirsch) and Beverly (Christine Baranski), and Sheldon's devoutly religious mother, Mary (Laurie Metcalf), come to town. Also, Wolowitz and Koothrappali think the government is out to get them when they are contacted about their guidance system. Poll: How would you rate this episode?

The Platonic Permutation - Season 9, Episode 9 Airs Thursday, November 19 at 8/7c on CBS Sheldon and Amy try hanging out as friends when they spend Thanksgiving together at the Aquarium. Also, Wolowitz reluctantly agrees to volunteer at the soup kitchen with Bernadette, Raj, and Emily, and Penny discovers that Leonard knows more about her than she thought. Elon Musk appears as himself. Rate the Episode

The Mystery Date Observation - Season 9, Episode 8 Airs Thursday, November 12 at 8/7c on CBS Sheldon, Wolowitz and Koothrappali post an online advertisement to find Sheldon a new girlfriend Also, when Amy is coy with the details of a guy she is dating, Penny and Bernadette decide to spy. Stephen Merchant and Analeigh Tipton guest star. Rate the Episode

'The Spock Resonance' - Season 9, Episode 7 Airs Thursday, November 5 at 8/7c on CBS. While being interviewed for a documentary about Spock from "Star Trek," Sheldon struggles to suppress his emotions about his recent break-up with Amy. Also, Wolowitz and Bernadette butt heads over remodeling his childhood home. Rate the Episode

'The Helium Insufficiency' - Season 9, Episode 6 Airs Monday, October 26 at 8/7c on CBS. In the midst of a nation-wide helium shortage, Sheldon and Leonard take desperate measures to get the supplies they need. Also, Penny and Bernadette download a dating app on Amy's phone to try and find her a new man. Michael Rapaport guest stars. Rate the episode

'The Status Quo Combustion' - Season 7, Episode 24 Airs Thursday, May 15 at 8/7c on CBS. 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. Christine Baranski returns as Beverly Hofstadter in this episode.

'The Proton Transmogrification' - Season 7, Episode 22 Airs Thursday, May 1 at 20:00 on CBS. Professor Proton helps Sheldon cope with grief, while Leonard turns a relationship milestone into a competition with Penny. Meanwhile, Amy and Bernadette make a "Star Wars Day" gift for the guys. Spoilers: Please only post about storylines which have been revealed in the episode's press release and subsequent promos. Discussion of other plot points should remain in the spoiler threads until the episode has aired.

'The Relationship Diremption' - Season 7, Episode 20 Airs Thursday, April 10 at 20:00 on CBS. Sheldon faces a personal crisis after deciding he's wasting his time with string theory. Meanwhile, a double date between Raj, Emily and the Wolowitzes ends in embarrassment for Howard. Spoilers: Please only post about storylines which have been revealed in the episode's press release and subsequent promos. Discussion of other plot points should remain in the spoiler threads until the episode has aired.

'The Indecision Amalgamation' - Season 7, Episode 19 Airs Thursday, April 3 at 8/7c on CBS. While Raj is wracked with guilt when he tries to date two women at once, Penny wrestles with whether to take a role in a cheesy movie and Sheldon is torn trying to choose between two gaming systems. Spoilers: Please only post about storylines which have been revealed in the episode's press release and subsequent promos. Discussion of other plot points should remain in the spoiler threads until the episode has aired.

'The Mommy Observation' - Season 7, Episode 18 Thursday, March 13 at 8/7c on CBS. When Sheldon visits his Mom in Houston, he is forced to confront a new reality. Meanwhile, Raj's "Murder Mystery" party starts some fights within the gang. Spoilers: Please only post about storylines which have been revealed in the episode's press release and subsequent promos. Discussion of other plot points should remain in the spoiler threads until the episode has aired.

The Table Polarization – Leonard buys a dining room table and it causes Sheldon to reevaluate the changes in his life. Meanwhile, Wolowitz is offered a chance to go back to space and Bernadette struggles with whether or not to encourage him, on THE BIG BANG THEORY, Thursday, Feb. 27 (8:00 – 8:31 PM, ET/PT) on the CBS Television Network.

The Convention Conundrum – After the guys can't get Comic-Con tickets, Sheldon tries to hold his own convention and winds up spending a wild night with James Earl Jones. Meanwhile, the girls see if they can act like "grown-ups," on THE BIG BANG THEORY, Thursday, Jan. 30 (8:00 – 8:31 PM, ET/PT) on the CBS Television Network. James Earl Jones and Carrie Fisher appear as themselves.

The Occupation Recalibration – Sheldon tries to relax after he is forced to take a vacation. Meanwhile, Leonard struggles to be supportive of Penny after she quits her job, and Bernadette seeks Stuart’s help in replacing one of Howard’s comic books, on THE BIG BANG THEORY, Thursday, Jan. 9 (8:00 – 8:31 PM, ET/PT) on the CBS Television Network. Josh Peck guest stars as Jesse, the owner of a rival comic book store.

The Cooper Extraction – While Sheldon is away in Texas, everyone gathers to decorate the apartment Christmas tree, and they each realize how much he has changed their lives, on THE BIG BANG THEORY, Thursday, Dec. 12 (8:00 – 8:31 PM, ET/PT) on the CBS Television Network. Laurie Metcalf returns as Mary Cooper, while Brian Thomas Smith reprises his role as Penny's ex, Zack.

The Discovery Dissipation – Leonard and Amy help Sheldon cope with the shame he’s feeling after his accidental contribution to science is disproved. Meanwhile, Raj must stay with Howard and Bernadette for a week, on THE BIG BANG THEORY, Thursday, Dec. 5 (8:00 – 8:31 PM, ET/PT) on the CBS Television Network. Wil Wheaton returns and John Ross Bowie reprises his role as Barry Kripke. NPR's Ira Flatow appears as himself in this episode.

The Thanksgiving Decoupling – Sheldon protests when the gang drags him to Mrs. Wolowitz’s house for Thanksgiving. Meanwhile, Penny and Leonard must deal with a mistake from her past, on THE BIG BANG THEORY, Thursday, Nov. 21 (8:00 – 8:31 PM, ET/PT) on the CBS Television Network.

The Itchy Brain Simulation – Leonard tries to keep Sheldon from overreacting when a past mistake comes to light, but Sheldon punishes Leonard by making him walk a mile in his shoes. Meanwhile, Penny confronts Raj’s ex-girlfriend, Lucy, on THE BIG BANG THEORY, Thursday, Nov. 14 (8:00 – 8:31 PM, ET/PT) on the CBS Television Network.

Come on people, they've had Steven Hawking and the voice of Leonard Nimoy, the time is well due for the man himself....William Shatner, to appear ! Who agrees ? Who disagrees ? What context should the Shat show up in ? (BTW I met him back in 2011, when he was visiting my poor little country, and he was amazing, really funny, especially when unrehearsed, and very inspiring ! So I guess you can tell what my opinion on whether to feature Shatner or not is ). On that note, I wonder if they thought about having Henry Cavill make a guest appearance, since he was dating Kaley Cuoco for a while (and apparently he's a huge fan of the show) and of course, is Superman !

The Raiders Minimization - Sheldon seeks revenge after Amy ruins one of his favorite movies. Meanwhile, Leonard discovers a way to get Penny to do anything, and Raj and Stuart create online dating profiles, on THE BIG BANG THEORY, Thursday, Oct. 10 (8:00 – 8:31 PM, ET/PT) on the CBS Television Network.

"The Proton Resurgence" - Sheldon and Leonard hire Professor Proton, the host of their favorite childhood TV show, to perform. Also, Howard and Bernadette run into trouble babysitting Raj's dog, on THE BIG BANG THEORY, Thursday, May 2 (8:00 - 8:31 PM, ET/PT) on the CBS Television Network. Episode Guide | Wiki