Leonard and Raj run into a restaurant customer who looks just like Nathan Fillion. "The Comic Book Store Regeneration" is the 15th episode of the show's eighth season.
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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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Howard and Leonard must get a pigeon out of the clean room at the University on The Big Bang Theory.
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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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Johnny Galecki plays Leonard Hofstadter on The Big Bang Theory
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Bernadette and Amy bring the Death Star Cake to the Star Wars Day celebration.
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After having an emotional dream, Sheldon hugs Leonard to show he cares.
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Amy and Bernadette make a Death Star Cake to celebrate Star Wars Day.
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TBBT Quotes

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

Howard: Attention people of Earth: Tonight, there will be two moons in the sky.