Amy finds out that Sheldon applied for a one-way trip to Mars on The Big Bang Therapy. "The Colonization Application" is the 17th episode of the show's eighth season.
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Penny and Sheldon design an experiment made to get the participants to fall in love on The Big Bang Theory.
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Sheldon and Leonard go dress shopping with Penny and Amy on The Big Bang Theory. "The Space Probe Disintegration" is the 12th episode of the show's eighth season.
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Sheldon says goodby to "Fun with Flags" on The Big Bang Theory. "The Champagne Reflection" is the tenth episode of the show's eighth season.
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Leonard has minor surgery on his nose on The Big Bang Theory. "The Septum Deviation" is the ninth episode of the show's eighth season.
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Amy and Bernadette plan a rooftop prom on The Big Bang Theory. "The Prom Equivalency" is the eighth 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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Jim Parson plays Sheldon Cooper 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.

Sheldon: Nothing more fun than a paradigm shifting evening of science.
Penny: (to Leonard) And you thought it was soaping me up in the shower.