The Monopolar Expedition

The guys' prestigious offer to work over the summer at the North Pole -- and Penny's resultant behavior -- leaves Leonard unsure if he should go.

Season 2 | Episode 23


Jim Parsons

as Sheldon Cooper

Johnny Galecki

as Leonard Hofstadter

Kaley Cuoco

as Penny

Simon Helberg

as Howard Wolowitz

Kunal Nayyar

as Raj Koothrappali