Raj and Sheldon head into a steam tunnel for an experiment on The Big Bang Theory. "The Expedition Approximation" is the sixth episode of the show's eighth season.
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The boys look to make something new and cool but end up procrastinating on The Big Bang Theory. "The Focus Attentuation" is the fifth episode of the show's eighth season.
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Raj gets into trouble when his girlfriend gives Penny the cold shoulder on The Big Bang Theory. "The Hook-Up Reverberation" is the fourth episode of the show's eighth season.
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Wolowitz practices before pitching in the big game on The Big Bang Theory. "The First Pitch Insufficiency" is the third episode of the show's eighth season.
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Everyone is shocked when Howard signs up to take Sheldon's class on The Big Bang Theory. "The Junior Professor Solution" is the second episode of the show's eighth season.
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A little help here? Sheldon is in Arizona on The Big Bang Theory Season 8 premiere.
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Mayim Bialik plays Amy Farrah Fowler on The Big Bang Theory
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Melissa Rauch plays Bernadette Rostenkowski on The Big Bang Theory
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TBBT Quotes

Sheldon: Why do you have the Chinese character for "soup" tattooed on your right buttock?
Penny: It's not "soup," it's "courage."
Sheldon: No it isn't. But I suppose it does take courage to demonstrate that kind of commitment to soup.
Penny: How'd you see it? You said you wouldn't look.
Sheldon: Sorry. As I told you, the hero always peeks.

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.