The Big Bang Theory

2007•12 series•Entertainment / Comedy

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Mensa-fied best friends and roommates Leonard and Sheldon, physicists who work at the California Institute of Technology, may be able to tell everybody more than they want to know about quantum physics, but getting through most basic social situations, especially ones involving women, totally baffles them. How lucky, then, that babe-alicious waitress/aspiring actress Penny moves in next door. Frequently seen hanging out with Leonard and Sheldon are friends and fellow Caltech scientists Wolowitz and Koothrappali. Will worlds collide? Does Einstein theorize in the woods?

Episode 1The Locomotion Interruption

Leonard and Amy take a road trip to Arizona to rescue Sheldon (S8 Ep1)

Episode 2The Junior Professor Solution

When Sheldon is forced to teach a university course, Howard enrols on it (S8 Ep2)

Episode 3The First Pitch Insufficiency

NASA asks a nervous Howard to throw the first pitch at a baseball game (S8 Ep3)

Episode 4The Hook-Up Reverberation

Raj's honesty about his past comes back to haunt him after Emily snubs Penny (S8 Ep4)

Episode 5The Focus Attenuation

Penny works during a girls' trip to Vegas, spoiling Amy and Bernadette's fun (S8 Ep5)

Episode 6The Expedition Approximation

Sheldon and Raj test whether they could survive research expedition (S8 Ep6)

Episode 7The Misinterpretation Agitation

The guys help Penny out of an awkward situation with a smitten doctor (S8 Ep7)

Episode 8The Prom Equivalency

The girls decide to re-enact their high-school proms with their current partners (S8 Ep8)

Episode 9The Septum Deviation

When Leonard has minor surgery on his nose, Sheldon's the one in need of sympathy (S8 Ep9)

Episode 10The Champagne Reflection

Sheldon says goodbye to Fun with Flags as he and Amy record the final episode (S8 Ep10)

Episode 11The Clean Room Infiltration

Amy hosts a Victorian Christmas Eve dinner, complete with party games (S8 Ep11)

Episode 12The Space Probe Disintegration

Howard tries to calm Raj as he anxiously awaits data from a space probe (S9 Ep20)

Episode 13The Anxiety Optimization

Sheldon asks his friends to make him anxious, hoping to cure his mental block (S8 Ep13)

Episode 14The Troll Manifestation

Leonard and Sheldon defend their co-authored paper against negative comments (S8 Ep14)

Episode 15The Comic Book Store Regeneration

The gang prepare for the reopening of Stuart's comic book shop (S8 Ep15)

Episode 16The Intimacy Acceleration

Sheldon and Penny try an experiment designed to make participants fall in love (S8 Ep16)

Episode 17The Colonization Application

Amy learns that Sheldon has applied to take part in a one-way mission to Mars (S8 Ep17)

Episode 18The Leftover Thermalization

A power cut at Mrs Wolowitz's house defrosts the last meal she ever prepared (S8 Ep18)

Episode 19The Skywalker Incursion

Leonard and Sheldon detour on the way to Berkeley to meet one of their idols (S8 Ep19)

Episode 20The Fortification Implementation

A new phase of Sheldon and Amy's relationship begins with a blanket fort (S8 Ep20)

Episode 21The Communication Deterioration

Raj is asked to create a message to be used if NASA finds alien life (S8 Ep21)

Episode 22The Graduation Transmission

The Graduate Transmission: Leonard is invited to give the commencement address at his former high school (S8 Ep22)

Episode 23The Maternal Combustion

Personalities collide when Sheldon and Leonard's mothers meet (S8 Ep23)

Episode 24The Commitment Determination

Sheldon pressures Leonard and Penny to choose a date for their wedding (S8 Ep24)

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