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In the season 6 finale of The Big Bang Theory, Penny and Sheldon are shocked when Leonard considers taking a great job opportunity overseas.
The women end up playing Dungeon and Dragons with the boys when their vacation to Vegas is called off on The Big Bang Theory.
Bob Newhart guest stars as Professor Proton, the host of Sheldon's favorite childhood TV show on The Big Bang Theory.
When Sheldon's favorite TV show ends before its proper conclusion, Amy tries to help him deal with the loss on The Big Bang Theory.
The guys compete for tenure and shamelessly schmooze committee members including an HR person who has already had a run in with Sheldon on The Big Bang Theory.
On The Big Bang Theory, Howard uncovers a letter from his father who had left the family years before but he's unsure he wants to read it.
Sheldon, Howard, and Leonard give a presentation on careers in science to a group of junior high girls on The Big Bang Theory.
Sheldon gets to witness Penny's acting talents up close and Koothrapali's date walks out on him on The Big Bang Theory.
Everything goes awry when Leonard arranges a special Valentine's Day celebration for Penny and her ex shows up and Sheldon has his research assistant find a present for Amy on The Big Bang Theory.
Leonard moves in with Penny after he and Sheldon have a fight, meanwhile with Howard away on a trip Raj keeps on eye on Mrs. Wolowitz.
Sheldon reacts badly when he is forced to work with his arch nemesis Barry Kripke and Raj and Howard buy action figures of themselves on The Big Bang Theory.
On The Big Bang Theory the boys head off to a comic book convention dressed as characters from Star Trek: The Next Generation.
Will Sheldon take Leonard, Raj, and Howard down with him when his is accused of sexual harassment on The Big Bang Theory.
Sheldon remembers past Christmases during a game of Dungeons and Dragons while the ladies try to find a girl for Koothrappali on The Big Bang Theory.
On The Big Bang Theory, Wolowitz goes on a fishing trip with his father-in-law while Sheldon takes care of a sick Amy.
The whole gang gets involved when the university reassigns Sheldon's parking spot to Wolowitz on his return from space on The Big Bang Theory.
When Sheldon begins disappearing every day at 2:45pm, Howard and Raj make it their mission to find out where he's going on The Big Bang Theory.
Sheldon gets caught in the middle of an argument between Amy and Will Wheaton (playing himself) while the new Mrs Wolowitz wants her husband out of his ex-wife's house on The Big Bang Theory.
On The Big Bang Theory, Sheldon and his idol Stephen Hawking get into an argument over the game Words with Friends which could put their relationship in jeopardy.
On The Big Bang Theory, the gang spends Halloween at Stuart's comic book shop while Leonard attempts a new approach to seduce Penny. Astronaut Buzz Aldrin guest stars.
Wolowitz doesn't get the warm welcome he expected upon his return and game night turns ugly on The Big Bang Theory.
Amy isn't happy when Sheldon hires a new assitant and Wolowitz begins to feel the pressures of being in space on The Big Bang Theory.
On The Big Bang Theory, Howard gets picked on in space while Sheldon unearths a secret of Penny and Leonard's.
His friends all go on dates to kick off The Big Bang Theory Season 6. As a result, Raj must face his loneliness.