Johnny Galecki as Leonard Hofstadter
Johnny Galecki stars in The Big Bang Theory as Leonard Hofstadter, a physicist at Caltech. Leonard is the more social of his nerd friends.

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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.