Jim Parsons and Will Deutsch in The Big Bang Theory (2007)

Johnny Galecki, Jim Parsons, and Jane Galloway Heitz in The Big Bang Theory (2007)

Simon Helberg and Ken Lerner in The Big Bang Theory (2007)

Simon Helberg and Jan Hoag in The Big Bang Theory (2007)

Howie Mandel, Simon Helberg, and John Mendoza in The Big Bang Theory (2007)

Howie Mandel and Simon Helberg in The Big Bang Theory (2007)

John Mendoza and Melissa Rauch in The Big Bang Theory (2007)

Pasha D. Lychnikoff and Michael Massimino in The Big Bang Theory (2007)

Michael Massimino in The Big Bang Theory (2007)

Simon Helberg in The Big Bang Theory (2007)

Kevin Sussman, Marcus Folmar, and Kunal Nayyar in The Big Bang Theory (2007)

Marcus Folmar in The Big Bang Theory (2007)

Kaley Cuoco and Sara Erikson in The Big Bang Theory (2007)

Kaley Cuoco, Sara Erikson, and Kelli Goss in The Big Bang Theory (2007)

Neil deGrasse Tyson and Jim Parsons in The Big Bang Theory (2007)

Neil deGrasse Tyson and Kunal Nayyar in The Big Bang Theory (2007)

Johnny Galecki and Ally Maki in The Big Bang Theory (2007)

George Takei, Simon Helberg, Katee Sackhoff, and Melissa Rauch in The Big Bang Theory (2007)

Simon Helberg and Katee Sackhoff in The Big Bang Theory (2007)

Bob Newhart in The Big Bang Theory (2007)

Christine Baranski in The Big Bang Theory (2007)

Mayim Bialik, Kaley Cuoco, Johnny Galecki, Simon Helberg, Jim Parsons, Melissa Rauch, and Kunal Nayyar in The Big Bang Theory (2007)

Mayim Bialik and Jim Parsons in The Big Bang Theory (2007)

Jason Kravits, Kaley Cuoco, and Melissa Rauch in The Big Bang Theory (2007)

Wil Wheaton, Mayim Bialik, and Jim Parsons in The Big Bang Theory (2007)

Sean Astin, Mayim Bialik, Kal Penn, and Jim Parsons in The Big Bang Theory (2007)

Mayim Bialik, Kaley Cuoco, Johnny Galecki, and Jim Parsons in The Big Bang Theory (2007)

Mayim Bialik in The Big Bang Theory (2007)

Simon Helberg and Kurt Scholler in The Big Bang Theory (2007)

Jim Parsons in The Big Bang Theory (2007)

Kathy Bates and Jim Parsons in The Big Bang Theory (2007)

Johnny Galecki in The Big Bang Theory (2007)

Johnny Galecki and Kunal Nayyar in The Big Bang Theory (2007)

Kaley Cuoco and Johnny Galecki in The Big Bang Theory (2007)

Kaley Cuoco and Jim Parsons in The Big Bang Theory (2007)

Kunal Nayyar in The Big Bang Theory (2007)

Melissa Rauch in The Big Bang Theory (2007)