Actors: Johnny Galecki | The Big Bang Theory
18 Unknown facts about Johnny Galecki- Leonard from The Big Bang Theory - CinemaProbe
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Leonard Hofstadter - Big Bang Theory - Johnny Galecki - Profile - Writeups.org
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Johnny Galecki - Wikipedia
Leonard Hofstadter - Wikipedia
The Big Bang Theory Cast, Then and Now
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The Big Bang Theory: Why Sheldon star always knew Johnny Galecki would be cast as Leonard | TV & Radio | Showbiz & TV | Express.co.uk
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Johnny Galecki's birthday: How well do you know TBBT's Leonard Hofstadter? | Web Series
