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Raj and Sheldon try to simulate a dark-matter research expedition; after a fight about money, Penny and Leonard turn to Bernadette and Wolowitz for advice.

Raj and Sheldon try to simulate a dark-matter research expedition; after a fight about money, Penny and Leonard turn to Bernadette and Wolowitz for advice.

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The Big Bang Theory

S9, EP21 "The Viewing Party Combustion"

During a group get-together, a minor argument between Sheldon and Leonard turns into a heated debate, leaving the rest of the gang to choose sides.

The Big Bang Theory

S9, EP22 "The Fermentation Bifurcation"

The gang runs into Penny's old boyfriend while out at a wine bar; Bernadette spends an evening with Sheldon; Koothrappali's introduction of his new girlfriend doesn't go as planned.

The Big Bang Theory

S9, EP23 "The Line Substitution Solution"

Sheldon wants to go to a movie screening, so he pays Stuart to spend the day with Amy; Penny has a difficult time connecting with Leonard's visiting mother.

The Big Bang Theory

S9, EP24 "The Convergence Convergence"

Leonard's recently divorced parents and Sheldon's devoutly religious mother visit; when they are contacted about their guidance system, Wolowitz and Koothrappali think the government is after them.

The Big Bang Theory

S9, EP20 "The Big Bear Precipitation"

Sheldon shares a secret about Leonard when the two go on a weekend trip with Penny and Amy; Koothrappali goes all out with pregnancy gifts.

The Big Bang Theory

S9, EP19 "The Solder Excursion Diversion"

Sheldon makes a surprise revelation when Amy buys him a new laptop; Leonard and Wolowitz get sold out by Koothrappali after lying to their wives to attend a movie screening.

The Big Bang Theory

S9, EP18 "The Application Deterioration"

Leonard, Sheldon and Wolowitz file for a patent on their new invention; Penny, Amy and Bernadette give dating advice to Koothrappali after his breakup with Emily.

The Big Bang Theory

S9, EP17 "The Celebration Experimentation"

For the first time in nine years, the gang celebrates Sheldon's birthday -- surprising him with a special guest.

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?
Starring: Brian George, Christine Baranski, Jim Parsons, John Ross Bowie, Johnny Galecki, Kaley Cuoco, Kaley Cuoco-Sweeting, Kevin Sussman, Kunal Nayyar, Laura Spencer, Laurie Metcalf, Mayim Bialik, Melissa Rauch, Sara Gilbert, Simon Helberg
Original Air Date: Sep 24, 2007
Genres: ComedyTV Series
Rating: TVPG
Playback: HD
3 seasons available on demand
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