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.

Or at least this moment, in the 88th episode of the show, is when it concluded. It began in Season 4 Episode 24 where the show leaves on a cliffhanger that consists of Penny and Raj making out and ...