The Big Bang Theory

CBS | 8:00 pm

Koothrapalli (Kunal Nayyar) finds himself in the middle of some intense domestic drama when he discovers that Nell (guest star Beth Behrs, "2 Broke Girls"), the woman he has been dating, actually has a husband, Oliver (guest star Walton Goggins, "Justified") — and he is very unhappy about the situation, in the new episode "The Separation Triangulation." Elsewhere, Sheldon (Jim Parsons) needs a quiet place to work, so he rents his old room back from Leonard and Penny (Johnny Galecki, Kaley Cuoco).