Cast (5)

Johnny Galecki

Leonard Hofstadter

Jim Parsons

Sheldon Cooper

Kaley Cuoco

Penny

Simon Helberg

Howard Wolowitz

Kunal Nayyar

Rajesh Koothrappali

Crew (5)

Directing

Mark Cendrowski

Director

Writing

Bill Prady

Story

David Goetsch

Story

Tim Doyle

Teleplay

Stephen Engel

Teleplay

Guest stars (3)

Summer Glau

Self

Robert Clotworthy

Train Conductor (voice)

George F. Smoot

George F. Smoot