Mayim Bialik and Johnny Galecki in The Big Bang Theory (2007)

Judd Hirsch, Christine Baranski, Johnny Galecki, Laurie Metcalf, and Jim Parsons in The Big Bang Theory (2007)

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

Keith Carradine, Katey Sagal, Kaley Cuoco, and Jack McBrayer in The Big Bang Theory (2007)

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

Keith Carradine, Judd Hirsch, Christine Baranski, Katey Sagal, Kaley Cuoco, Johnny Galecki, Simon Helberg, Kevin Sussman, and Melissa Rauch in The Big Bang Theory (2007)

Keith Carradine, Judd Hirsch, Christine Baranski, Katey Sagal, Mayim Bialik, Kaley Cuoco, Johnny Galecki, Simon Helberg, Laurie Metcalf, Kevin Sussman, Jim Parsons, Jack McBrayer, Melissa Rauch, and Kunal Nayyar in The Big Bang Theory (2007)

Laurie Metcalf and Jim Parsons in The Big Bang Theory (2007)

Judd Hirsch and Johnny Galecki in The Big Bang Theory (2007)

Judd Hirsch, Christine Baranski, and Kevin Sussman in The Big Bang Theory (2007)

Keith Carradine, Christine Baranski, Katey Sagal, Kaley Cuoco, Johnny Galecki, and Jack McBrayer in The Big Bang Theory (2007)

Keith Carradine, Katey Sagal, Kaley Cuoco, Simon Helberg, and Jim Parsons in The Big Bang Theory (2007)

Dean Norris 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)

Judd Hirsch, Mayim Bialik, and Laurie Metcalf in The Big Bang Theory (2007)

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

Keith Carradine and Kaley Cuoco in The Big Bang Theory (2007)

Simon Helberg, Melissa Rauch, and Kunal Nayyar in The Big Bang Theory (2007)

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

Keith Carradine, Katey Sagal, Kaley Cuoco, Johnny Galecki, and Jack McBrayer in The Big Bang Theory (2007)