Louie Kritski is a heartless landlord who has been so negligent in keeping up his ghetto apartment that he is threatened with jail time. The judge gives him another option -- he must live in his rat-infested hell hole until he brings it up to liveable standards.
Richard, a lonely and well-meaning prison officer, is put in charge of reading and censoring the letters received by inmates.
Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.