TV

'Big Bang Theory' Cast: Now and Then

Big Bang theory cast
CBS
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'Big Bang Theory' Cast: Now and Then

By Emily Krauser

6:13 PM PDT, May 3, 2019

Bazinga! After 12 seasons on air, The Big Bang Theory is coming to an end after clocking in a whopping 279 episodes. Before we say goodbye to the beloved sitcom with its series finale on May 16, let's take a look back at how much Sheldon, Leonard, Penny and company have changed from season one to today. 

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Jim Parsons: Then

Leonard in s1 of big bang theory
Robert Voets/CBS

Sheldon Cooper, season one.

Jim Parsons: Now

"The Donation Oscillation" -- Sheldon Cooper (Jim Parsons)
Michael Yarish/Warner Bros. Entertainment

Sheldon Cooper, season 12.

Johnny Galecki: Then

leonard in s1 of big bang theory
Robert Voets/CBS

Leonard Hofstadter, season one.

Johnny Galecki: Now

Leonard Hofstadter (Johnny Galecki) in big bang theory
Michael Yarish/Warner Bros. Entertainment

Leonard Hofstadter, season 12.

Kaley Cuoco: Then

Penny in season 1 of big bang theory
Robert Voets/CBS

Penny, season one. (Fun fact: she's the only main character who's last name has never been revealed.)

Kaley Cuoco: Now

"The Confirmation Polarization" -- Penny (Kaley Cuoco)
Michael Yarish/Warner Bros. Entertainment

Penny, season 12.

Simon Helberg: Then

Simon Helberg in s1 of big bang theory
Ron Batzdorff/Warner Bros.

Howard Wolowitz, season one.

Simon Helberg: Now

"The Consummation Deviation" - Howard Wolowitz (Simon Helberg).
Sonja Flemming/CBS

Howard Wolowitz, season 12.

Kunal Nayyar: Then

Kunal Nayyar in s1 of big bang theory
Monty Brinton/CBS

Rajesh Koothrappali, season one.

Kunal Nayyar: Now

"The Paintball Scattering" -Rajesh Koothrappali (Kunal Nayyar)
Michael Yarish/Warner Bros. Entertainment

Rajesh Koothrappali, season 12.

Mayim Bialik: Then

Mayim Bialk in s4 of big bang theory
Sonja Flemming/CBS

Amy Farrah Fowler, season four (Bialik's character was first introduced in the season three finale.

Mayim Bialik: Now

Amy Farrah Fowler (Mayim Bialik) - "The Laureate Accumulation"
Michael Yarish/CBS

Amy Farrah Fowler, season 12.

Melissa Rauch: Then

Bernadette in s3 of big bang theory
Cliff Lipson/CBS

Bernadette Rostenkowski, season three.

Melissa Rauch: Now

Bernadette (Melissa Rauch) - "The Conference Valuation"
Michael Yarish/Warner Bros. Entertainment

Bernadette Rostenkowski, season 12.

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