The Irish Pub Formulation

When Raj's sister has a one-day layover he forbids the others from hooking up with her, unaware she and Leonard already did long ago.

Season 4 | Episode 6
TV-14-DL
PRESENTED BY
Cast

Jim Parsons

Sheldon Cooper

Johnny Galecki

Leonard Hofstadter

Kaley Cuoco

Penny

Simon Helberg

Howard Wolowitz

Kunal Nayyar

Raj Koothrappali