Directed by: Mark Cendrowski
Story by : Chuck Lorre & Eric Kaplan & Jim Reynolds
Teleplay by : Steven Molaro & Steve Holland & Maria Ferrari
Original air date: September 26, 2013
Leonard surprises Penny by arriving back early and hiding in her apartment. He asks her to keep it a secret from Sheldon, so they can spend some time alone. Sheldon suspects that Penny is cheating on Leonard when he finds clear signs that someone else is in her apartment. Bursting into Penny’s place to catch her in the act, he and Amy find Leonard there. Sheldon gets mad at Leonard for not telling him he is home, and refuses to believe anything he says, though with Howard’s help they eventually reconcile. Meanwhile, Howard experiences weight gain and mood swings; he had applied estrogen ointment to his mother without gloves, so absorbing it through his skin. Raj reassures him in a way that’s just too intimate, shocking Bernadette.