
MTV is a global youth culture brand inspired by music. It’s online hub MTV.com is a leading destination for music, news and pop culture.

During their weekend in Las Vegas, Bernadette and Amy accuse Penny of being a buzz kill; the guys try to invent the next big thing.

Raj and Sheldon try to simulate a dark-matter research expedition; after a fight about money, Penny and Leonard turn to Bernadette and Wolowitz for advice.

The guys try to help when Penny is faced with an awkward dilemma at work; Bernadette and Amy discuss sexuality and female scientists.

Sheldon feels pressured to participate in romantic traditions when the gang re-creates a high-school prom on the roof.

Leonard has minor surgery on his nose, causing Sheldon to overreact; Bernadette and Howard work on their marriage.

College student Beca knows she does not want to be part of a clique, but that's exactly where she finds herself after arriving at her new school. Thrust in among mean gals, nice gals and just plain weird gals, Beca finds that the only thing they have in common is how well they sing together. She takes the women of the group out of their comfort zone of traditional arrangements and into a world of amazing harmonic combinations in a fight to the top of college music competitions.

Cady Heron enrolls at North Shore High School near Chicago after living in Africa. She interacts with Regina George, a prominent student who previously dated Aaron Samuels. Conflict arises when Heron develops an interest in Samuels, leading George to feign a friendship with Heron while attempting to maintain her relationship with Samuels. Both students engage in competitive social behavior that affects the student body.

Rob, Chanel and Steelo just barely make it to safety in "Inches from Disaster," get hurt and dizzy in "Spinjuries," and realize that sometimes it is a good idea to "Judge the Cover."