How 'The Big Bang Theory' Worked Around Kaley Cuoco's Injury In Season 4, Kaley Cuoco wasn't able to make a full return to work even outside the two episodes where Penny was written out.

The Big Bang Theory Season 6, Episode 20, “The Tenure Turbulence,” pits Sheldon, Raj, and Leonard against each other as they all go after a tenure position that opens up at their workplace ...