Chaos Theory (a.k.a. Unknown Origin) - S9-E1
Trivia: The character of Haleh was supposed to appear in this episode but was written out, and with good reason. This episode picks up right where the previous season's finale left off, but the actress who plays Haleh had lost over 100 pounds over the summer hiatus.
Answer: It was in "Chaos Theory", the first episode of season 9 (time code 00:13:55).
Super Grover ★