Premise

Two nerdy physicists share an apartment and an unlikely friendship with their beautiful neighbor with whom one of them is infatuated. Like the universe after the big bang, the show's popularity expanded, thanks to breakout star Jim Parsons, along with the chemistry among the friends and the developing romance between Leonard and Penny. The addition of Melissa Rauch and Mayim Bialik in later seasons also enhanced the stories and relationships of the leads.

Cast

Guest Stars

Kevin Sussman
Stuart
47 Episodes (2009-2017)
Carol Ann Susi
Mrs. Wolowitz
21 Episodes (2008-2014)
Sara Gilbert
Instructor, Leslie Winkle
20 Episodes (2007-2016)
John Ross Bowie
Barry Kripke, Kripke
19 Episodes (2009-2016)
Ellen, Emily, Emily Sweeney
15 Episodes (2014-2017)
Wil Wheaton
Himself
13 Episodes (2009-2016)
Laurie Metcalf
Mary, Mary Cooper
10 Episodes (2007-2017)
Christine Baranski
Beverly, Beverly Hofstadter, Dr. Beverly Hofstadter
9 Episodes (2009-2016)
Dr. Koothrappali, Dr. V.M. Koothrappali
9 Episodes (2007-2017)
Priya
9 Episodes (2011-2011)
Mrs. Koothrappali
8 Episodes (2007-2012)
Zach, Zack
8 Episodes (2010-2016)
Carol Ann Susi
Mrs. Wolowitz, Mrs.Wolowitz
7 Episodes (2008-2014)
Mr. Rostenkowski
6 Episodes (2012-2015)
Brian Posehn
6 Episodes (2013-2017)
6 Episodes (2013-2017)
Dr. Eric Gablehauser, Gablehauser
5 Episodes (2007-2008)
5 Episodes (2012-2013)
Althea
5 Episodes (2007-2016)
Alessandra Torresani
5 Episodes (2016-2017)
Bob Newhart
Prof. Proton, Prof. Proton/Arthur, Professor Proton
4 Episodes (2013-2015)
Regina King
Mrs. Davis
4 Episodes (2013-2014)
Himself
4 Episodes (2012-2014)
Keith Carradine
3 Episodes (2010-2016)
Sara Rue
Stephanie
3 Episodes (2008-2008)
Joshua Malina
Pres. Seibert, Presdient Siebert
3 Episodes (2011-2012)
Stephen Merchant
Dave, Ethan
3 Episodes (2015-2015)
Guard, Police Officer, Security Guard
3 Episodes (2010-2016)
3 Episodes (2012-2012)
Cleaning Lady, Maria
3 Episodes (2008-2015)
Dakin Matthews
2 Episodes (2012-2014)
Judd Hirsch
Alfred
2 Episodes (2016-2016)
LeVar Burton
Himself
2 Episodes (2012-2014)
Himself
2 Episodes (2012-2016)
Stephen Root
2 Episodes (2014-2014)
Katee Sackhoff
Herself
2 Episodes (2009-2010)
Dean Norris
Col. Williams
2 Episodes (2016-2016)
Himself
2 Episodes (2009-2013)
Waiter
2 Episodes (2013-2014)
Katie Leclerc
2 Episodes (2011-2017)
Bethany, Hostess
2 Episodes (2009-2015)
Halley
2 Episodes (2016-2017)
Analeigh Tipton
Analeigh, Vanessa
2 Episodes (2008-2015)
Josh Brener
2 Episodes (2011-2013)
Adam West
Himself
1 Episode (2016)
Billy Bob Thornton
Dr. Oliver Lorvis
1 Episode (2014)
Brent Spiner
Himself
1 Episode (2011)
Carrie Fisher
Herself
1 Episode (2014)
Christopher Lloyd
1 Episode (2016)
D.J. Qualls
1 Episode (2008)
Eliza Dushku
FBI Agent
1 Episode (2010)
Jane Kaczmarek
Dr. Gallo
1 Episode (2016)
Jessica Walter
Mrs. Latham
1 Episode (2011)
Doctor/Man
1 Episode (2015)
Professor Goldfarb
1 Episode (2008)
Judy Greer
Dr. Elizabeth Plimpton
1 Episode (2010)
Katey Sagal
Susan
1 Episode (2016)
Kevin Smith
Himself
1 Episode (2015)
Angelo
1 Episode (2012)
Himself
1 Episode (2012)
Steve Valentine
Kenneth
1 Episode (2014)
Paramedic No. 2
1 Episode (2013)
Jonathan
1 Episode (2012)
Dr. Catherine Millstone
1 Episode (2009)
Officer Hackett
1 Episode (2010)
Nathan Fillion
Customer
1 Episode (2015)
Rick Fox
Glenn
1 Episode (2011)
Summer Glau
Herself
1 Episode (2009)
Jimmy
1 Episode (2011)
Security Guard
1 Episode (2015)
Bill Nye
Himself
1 Episode (2013)
Himself
1 Episode (2011)
Tania Raymonde
1 Episode (2014)
Professor Laughlin
1 Episode (2009)
Prof. Thorne
1 Episode (2014)
Mrs. Rostenkowski
1 Episode (2012)
Judge Taylor
1 Episode (2010)
Josh Peck
Jesse
1 Episode (2014)
Lewis Black
Professor Crawley
1 Episode (2009)
Stan Lee
Himself
1 Episode (2010)
Dimitri
1 Episode (2008)
Albert Einstein
1 Episode (2013)
Mrs. Fowler
1 Episode (2010)
Mrs. Lorvis
1 Episode (2010)
Buzz Aldrin
Himself
1 Episode (2012)
Dr. Dreyfus
1 Episode (2014)
Cheryl
1 Episode (2008)
Himself
1 Episode (2009)
Paramedic No. 1
1 Episode (2013)
Archimedes
1 Episode (2013)
June Squibb
Meemaw
1 Episode (2016)
1 Episode (2010)
Mrs. Gunderson
1 Episode (2010)
Lourdes
1 Episode (2008)
Security Guard No. 2
1 Episode (2015)
Josh Wolowitz
1 Episode (2015)
Octavia Spencer
Octavia
1 Episode (2008)
Halley
1 Episode (2016)
Ramona
1 Episode (2008)
Dave Roeger
1 Episode (2012)
Customer
1 Episode (2016)
Grace
1 Episode (2013)
Steve Wozniak
Himself
1 Episode (2010)
Tiffany Dupont
1 Episode (2011)
Waitress
1 Episode (2007)
Valerie Azlynn
1 Episode (2009)
Jack McBrayer
Randall
1 Episode (2016)
Maitre D'
1 Episode (2016)
Tate Ellington
Mitchell
1 Episode (2015)
Max Adler
Zombie
1 Episode (2015)
1 Episode (2016)
Officer Shin
1 Episode (2011)
Steven Yeun
Sebastian
1 Episode (2010)
Himself
1 Episode (2015)
Girl No. 2
1 Episode (2013)
Natalie
1 Episode (2015)
Jeanie
1 Episode (2014)
Joyce Kim
1 Episode (2010)
The Flash
1 Episode (2016)
Pizza Delivery Guy
1 Episode (2013)
Jeremy
1 Episode (2012)
Aaron
1 Episode (2012)

Credits

Executive Producer (5 Credits)
Co-Creator (1 Credit)
Cinematographer (2 Credits)
Producer (1 Credit)
3 Episodes (2008-2009)
Supervising Producer (3 Credits)
Co-Executive Producer (4 Credits)