The Big Bang Theory

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Watch The Big Bang Theory Season 2 full episodes online, free and paid options via our partners and affiliates.

Leonard in a Snuggie
Watch The Big Bang Theory Season 2 Episode 23
"The Monopolar Expedition"
Original Air Date:

When Sheldon gets news he's going to the North Pole on a NSF expedition, he invites the guys as his group.

Sheldon is Angry at Stuart
Watch The Big Bang Theory Season 2 Episode 22
"The Classified Materials Turbulence"
Original Air Date:

Howard enlists the help of the boys in order to fix his space toilet. Stuart and Penny go on their second date.

Raj and a Prostitute
Watch The Big Bang Theory Season 2 Episode 21
"The Vegas Renormalization"
Original Air Date:

When Wolowitz gets dumped by Leslie, Raj and Leonard take him to Las Vegas to get over his breakup. Meanwhile, Sheldon gets locked out of the apartment and has to crash at Penny's.

Leonard, Penny and Stuart
Watch The Big Bang Theory Season 2 Episode 20
"The Hofstadter Isotope"
Original Air Date:

A friend of the guys who works at the comic book store, Stuart (Kevin Sussman) hits it off with Penny, prompting Leonard and Wolowitz to head out to ladies' night at a local bar.

Raj Talks to Alicia
Watch The Big Bang Theory Season 2 Episode 19
"The Dead Hooker Juxtaposition"
Original Air Date:

Penny gets jealous of the guys' new sexy female neighbor (Valerie Azlynn)

Leonard Plays Laser Obstacle Chess
Watch The Big Bang Theory Season 2 Episode 18
"The Work Song Nanocluster"
Original Air Date:

The boys help Penny with her new business selling Penny Blossoms.

Wolowitz and Summer Glau
Watch The Big Bang Theory Season 2 Episode 17
"The Terminator Decoupling"
Original Air Date:

On a train ride to San Francisco, Leonard, Sheldon, Wolowitz, and Raj discover that Summer Glau is on their train ride.

Wolowitz and Winkle!
Watch The Big Bang Theory Season 2 Episode 16
"The Cushion Saturation"
Original Air Date:

A paintball game leads to a fight between Penny and Sheldon, but also for a romance between Wolowitz and Leslie!

Sheldon and Mrs. Hofstadter Sing
Watch The Big Bang Theory Season 2 Episode 15
"The Maternal Capacitance"
Original Air Date:

Leonard's mother, Mrs. Hofstadter (Christine Branksi) comes into town and she ends up being exactly like Sheldon.

Leonard Uses the Board
Watch The Big Bang Theory Season 2 Episode 14
"The Financial Permeability"
Original Air Date:

Sheldon lends Penny some money which makes Leonard go and try and collect some money from her ex-boyfriend Kurt for her.

Sheldon Goes Rock Climbing
Watch The Big Bang Theory Season 2 Episode 13
"The Friendship Algorithm"
Original Air Date:

In order to get time on the super computer at work that he needs for his experiment, Sheldon must befriend Kripke who is in charge of the device.

The Boys and MONTE
Watch The Big Bang Theory Season 2 Episode 12
"The Killer Robot Instability"
Original Air Date:

When Penny's comments about Wolowitz's love life sends him into depression, the boys are about to lose their most important teammate in an upcoming robot fighting competition.

Penny Meets Dave
Watch The Big Bang Theory Season 2 Episode 11
"The Bath Item Gift Hypothesis"
Original Air Date:

It's Christmas time and Sheldon is annoying everyone with his theories on gift giving etiquette. Meanwhile, Leonard gets jealous when Penny stars dating one of his handsome co-workers.

Sheldon and Leonard Discuss the Rules
Watch The Big Bang Theory Season 2 Episode 10
"The Vartabedian Conundrum"
Original Air Date:

When Sheldon and Penny convince Leonard that Stephanie has moved in, Sheldon tries to slow the relationship down.

Sheldon Seeks Penny's Help
Watch The Big Bang Theory Season 2 Episode 9
"The White Asparagus Triangulation"
Original Air Date:

Sheldon tries to secure Leonard's relationship with Stephanie and sets up a scenario where Leonard can prove he's the alpha male.

Leonard and Stephanie
Watch The Big Bang Theory Season 2 Episode 8
"The Lizard-Spock Expansion"
Original Air Date:

Wolowitz thinks he's found his soul mate, Dr. Stephanie Barnett (Sara Rue), until she meets Leonard. Wolowitz lets Stephanie drive the Mars rover, which gets stuck in a ditch.

Howard the Cable Guy
Watch The Big Bang Theory Season 2 Episode 7
"The Panty Piñata Polarization"
Original Air Date:

When Penny's cable goes out, she starts going over the guys' apartment to watch America's Next Top Model. However, after violating some of Sheldon's arbitrary rules, he bands her from coming over.

Sheldon and Romana
Watch The Big Bang Theory Season 2 Episode 6
"The Cooper-Nowitzki Theorem"
Original Air Date:

After an open house night at the University with grad students, an obsessive student Ramona Nowitzki (Riki Lindhome) likes Sheldon and makes her way into becoming his girlfriend / assistant.

Watch The Big Bang Theory Season 2 Episode 5
"The Euclid Alternative"
Original Air Date:

When Leonard needs to work the graveyard timeslot to gain access to the lasers for his experiment, Sheldon loses his ride to the university.

Watch The Big Bang Theory Season 2 Episode 4
"The Griffin Equivalency"
Original Air Date:

Raj is included in People's "30 under 30 to watch" list, prompting the rest of the group to be jealous.

Watch The Big Bang Theory Season 2 Episode 3
"The Barbarian Sublimation"
Original Air Date:

When Penny locks herself out of the apartment, she comes to hang out with Sheldon in his as he plays Age of Conan. Penny, frustrated by her recent failures in life soon plays and becomes addicted to Conan.

Leonard and Sheldon in Garb
Watch The Big Bang Theory Season 2 Episode 2
"The Codpiece Topology"
Original Air Date:

The guys return from the Renaissance fair and see Penny has already moved on to a new guy, Eric (Travis Schuldt), prompting Leonard to pursue a relationship with prior fling Leslie Winkle.

Penny and Leonard Return
Watch The Big Bang Theory Season 2 Episode 1
"The Bad Fish Paradigm"
Original Air Date:

Penny and Leonard return from their date from the end of season one and Leonard finds Howard and Raj spying on them via webcam.

The Big Bang Theory Season 2 Quotes

Sheldon [to Kripke]: Also, I am given to understand that your mother is overweight.
Raj: Oh, snap.
Sheldon: Now of course, if that is the result of a glandular condition and not sloth and gluttony then I withdraw that comment.

How is "doable" anything but a compliment?

Wolowitz
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