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When Wolowitz dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny's Halloween party; Leonard is shocked when Penny doesn't remember their first kiss.

When Wolowitz dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny's Halloween party; Leonard is shocked when Penny doesn't remember their first kiss.

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The Big Bang Theory

S9, EP3 "The Bachelor Party Corrosion"

A flat tire during Leonard's bachelor party weekend in Mexico tests the guys' skills; Penny is compelled to tell her family that she and Leonard eloped.

The Big Bang Theory

S9, EP4 "The 2003 Approximation"

An impending change to his living arrangements inspires Sheldon to revert to 2003, before he met Penny and Leonard; Raj and Howard form a band.

The Big Bang Theory

S9, EP5 "The Perspiration Implementation"

Barry Kripke expresses interest in Amy while leading a fencing lesson for the guys; when Stuart tries to attract female customers to the store, Penny, Amy and Bernadette help out.

The Big Bang Theory

S9, EP6 "The Helium Insufficiency"

Leonard and Sheldon go to great lengths to secure the helium they need during a nation-wide shortage; Bernadette and Penny try to find Amy a new man on a dating app.

The Big Bang Theory

S12, EP6 "The Imitation Perturbation"

When Wolowitz dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny's Halloween party; Leonard is shocked when Penny doesn't remember their first kiss.

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: Aarti Mann, 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, Simon Helberg, Wil Wheaton
Original Air Date: Sep 24, 2007
Genres: ComedyTV Series
Rating: TVPG
Playback: HD
9 seasons available on demand
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