Dean Norris and Jim Parsons in The Big Bang Theory (2007)

Kaley Cuoco in The Big Bang Theory (2007)

Johnny Galecki, Simon Helberg, Dean Norris, and Jim Parsons in The Big Bang Theory (2007)

Johnny Galecki, Simon Helberg, Jim Parsons, and Kunal Nayyar in The Big Bang Theory (2007)

Jim Parsons in The Big Bang Theory (2007)

Johnny Galecki, Simon Helberg, and Dean Norris in The Big Bang Theory (2007)

Johnny Galecki and Simon Helberg in The Big Bang Theory (2007)

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

Mayim Bialik, Kaley Cuoco, and Melissa Rauch in The Big Bang Theory (2007)

Mayim Bialik in The Big Bang Theory (2007)

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

Simon Helberg in The Big Bang Theory (2007)

Keith Carradine, Judd Hirsch, Christine Baranski, Katey Sagal, Mayim Bialik, Kaley Cuoco, Johnny Galecki, Simon Helberg, Laurie Metcalf, Jim Parsons, Jack McBrayer, and Melissa Rauch 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)

Simon Helberg and Kurt Scholler 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)