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

(Singing) Thor and Dr Jones, Thor and Dr. Jones. One plays with lightening, the other plays with bones.

Howard and Raj

I just gave you my virginity, woman. Cool your jets!

Sheldon