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When Leonard receives an exciting opportunity to work overseas, Penny and Sheldon are thrown for a loop.

The Big Bang Theory

The Bon Voyage Reaction

Amy and Sheldon's relationship takes a surprising turn during a game of "Dungeons & Dragons"; Lucy and Koothrappali have an awkward date.

The Love Spell Potential

Leonard and Sheldon hire the host (Bob Newhart) of their favorite childhood TV show to perform; Bernadette and Howard run into trouble while dog-sitting for Raj's pet.

The Proton Resurgence

Amy tries to help Sheldon get over his compulsive need for closure when one of his favorite TV shows is canceled; Raj discovers a secret about Lucy.

The Closure Alternative

The girls get involved when Leonard, Sheldon and Raj compete for tenure at the University.

The Tenure Turbulence

Howard considers whether or not he should open a letter from his father; Penny and Leonard host a "grown-up" cocktail party.

The Closet Reconfiguration

Leonard, Sheldon and Wolowitz talk to junior high girls about science-related careers; Raj plans a date with Lucy.

The Contractual Obligation Implementation

After a bad date, Koothrappali decides to never leave his apartment; Penny's acting skills impress Sheldon.

The Monster Isolation

The guys search for a perfect Valentine's Day gift for their significant others; Stuart and Raj host a "lonely people" party at the comic book store.

The Tangible Affection Proof

A fight between Sheldon and Leonard impacts Amy and Penny's living arrangements; while Howard is away, Raj helps Mrs. Wolowitz out.

The Spoiler Alert Segmentation

Sheldon faces a crisis of confidence when he is forced to work with his nemesis, Barry Kripke; Raj and Howard buy expensive action figures of themselves.

The Cooper/Kripke Inversion

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As the guys don costumes and go on a road trip to a comic book convention, the ladies decide to stay home and try to interpret a comic book.

The Bakersfield Expedition

Physicists and best friends Leonard and Sheldon learn about the social aspects of life through their relationships with the free-spirited beauty who moves in next door.

S6 E16 | The Tangible Affection Proof