The Big Bang Theory Cast: Before They Were Stars

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Where did The Big Bang Theory Cast get their start? Check out some of their early roles.

1. Jim Parsons as Sheldon Cooper

Jim Parsons as Sheldon Cooper
Parsons first credited TV role was in 2002 on an episode of Ed, while his first movie role was as Tim on Garden State. He most recently starred on HBO's The Normal Heart and earned an Emmy nomination. He's won four Emmys for his portrayal of Sheldon Cooper.

2. Jim Parsons on Judging Amy

Jim Parsons on Judging Amy
Jim Parsons portrayed Rob Holbrook on 7 episodes of CBS's Judging Amy.

3. Johnny Galecki as Leonard Hofstadter

Johnny Galecki as Leonard Hofstadter
Galecki's first role was on a TV movie, Time Out for Dad in 1987. He followed that up with small roles on several movies, before getting back into television. He played Danny Nash on American Dreamer and David MacGregor on Billy before getting his first well-known role on the comedy, Roseanne.

4. Johnny Galecki on Roseanne

Johnny Galecki on Roseanne
Johnny Galecki portrayed David Healy, Darlene's boyfriend, on Roseanne.

5. Kaley Cuoco-Sweeting as Penny - The Big Bang Theory

Kaley Cuoco-Sweeting as Penny - The Big Bang Theory
Cuoco-Sweeting's first role was on a TV movie, Quicksand: No Escape in 1992. She also played a young Angela on My So Called Life. Her big break came as Bridget Hennessy on 8 Simple Rules, which she followed up as Billie Jenkins on Charmed.

6. Kaley Cuoco-Sweeting on 8 Simple Rules

Kaley Cuoco-Sweeting on 8 Simple Rules
Kaley Cuoco-Sweeting portrayed Bridget Hennessy on 8 Simple Rules.

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TBBT Quotes

Sheldon: Are you still mad about the sperm bank?
Leonard: No!
Sheldon: Do you want to hear an interesting thing about stairs?
Leonard: Not really.
Sheldon: If the height of a single step is off by as little as two millimeters most people will trip.
Leonard: I don't care—two millimeters?! That doesn't seem right.
Sheldon: No, it's true! I did a series of experiments when I was twelve; my father broke his clavicle.

Penny, there's only one cookie with something in the middle that solves life's problems, and that's an Oreo. Or a Nutter Butter, if you're in a pinch.

Sheldon