The Good Guy Fluctuation

The Good Guy Fluctuation is the seventh episode of the fifth season of The Big Bang Theory. It's to be aired on 27th October, 2011.

Summary


While out at the Comic Book store, Leonard meets a good-looking girl called Alice (Courtney Ford), who is also a comic book enthusiast. She gives him her phone-number to discuss trading comic books, but while at the apartment, they end up kissing. Leonard finds himself in a dilemma - he can either be a "good guy" and stay loyal to Priya, or a "bad guy" and have an affair with Alice. A discussion with Penny doesn't help, but after Sheldon offers him some advice from Friedrich Nietzsche, Leonard decides to go to Alice's apartment. However, he winds up changing his mind and confesses that he has a girlfriend to Alice, who promptly throws him out.

Meanwhile, a successful Halloween prank from the group enrages Sheldon, who starts working on ways to get revenge. However, his efforts always backfire - Leonard reverses his airbag prank on him, Raj thinks the snake Sheldon hid in his top drawer is a present, and when he attempts to trick Howard with an electric handshake, Howard and Bernadette pretend he has a heart condition and scare Sheldon further.

At the end of the episode, Leonard Skypes Priya and confesses to his actions. Priya is seemingly okay with it, but then reveals she has also cheated, and had sex with her ex-boyfriend a couple of weeks ago. Leonard is upset, and ends the call early. At that moment, Sheldon leaps out from under the couch cushions in zombie face paint, scaring Leonard. He triumphantly shouts "Bazinga, punk! Now we're even!"

Trivia

 * The mask Leonard uses to frighten Sheldon is a mask of the character "Balok" from the Star Trek original series episode "The Corbomite Maneuver".

Quote
When caught bringing home candy "for Halloween" the second night in a row, Penny responds that, "It's a rough month when Halloween and PMS hit at the same time."