House's ex-girlfriend Stacy Warner (guest star Sela Ward) returns, not to be with House, but to get his help for her ailing husband. While House decides whether or not to take the case, Cuddy instructs him to substitute for a sick professor and present a lecture to a class of medical students. As he weaves the stories of three patients (including guest star Carmen Electra) who all present with a similar symptom, House gives a lecture the students will never forget. In the end, they come out with a broader understanding of diagnostics and House's team comes out with a greater understanding of him. Cast: Hugh Laurie as Dr. Gregory House; Lisa Edelstein as Dr. Lisa Cuddy; Omar Epps as Dr. Eric Foreman; Robert Sean Leonard as Dr. James Wilson; Jennifer Morrison as Dr. Allison Cameron; Jesse Spencer as Dr. Robert Chase; Sela Ward as Stacy Warner; Carmen Electra as Carmen Electra