Simon Helberg and Elon Musk in The Big Bang Theory (2007)

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

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

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

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

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

Judd Hirsch, Christine Baranski, Mayim Bialik, Kaley Cuoco, Laurie Metcalf, and Jim Parsons in The Big Bang Theory (2007)

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

Laurie Metcalf in The Big Bang Theory (2007)

Jim Parsons in The Big Bang Theory (2007)

Mayim Bialik in The Big Bang Theory (2007)