Sheldon and his nemesis, Kripke (John Ross Bowie), compete for a corner office; Penny feels uncomfortable after receiving a gift from Amy.

SERIES regulars:

Leonard -Johnny Galecki

Sheldon -Jim Parsons

Penny -Kaley Cuoco

Wolowitz- Simon Helberg

Koothrappali- Kunal Nayyar

Amy-Mayim Bialik

Bernadette -Melissa Rauch

Recurring characters: John Ross Bowie as Barry Kripke and Joshua Malina as President Siebert

Guest star: Lynn Phillip Seibel as Professor Rothman

Air date: 16/02/2012