Why Is Josh in a Bad Mood?

Rebecca is hiding a big secret from Paula, which begins to affect their friendship. Josh and Greg switch roles when Josh makes a discovery that angers him, while Greg is happier than he has been in a long time

Bad Reputation

Mr. Schuester starts an investigation when a salacious list about members of the glee club circulates the halls of McKinley High. Meanwhile, Sue is mortified when a video of her performing the Olivia Newton-John classic "Physical" surfaces.

The Friendship Turbulence

Bernadette tries to negotiate peace between Sheldon and Wolowitz; Penny receives an embarrassing offer; Raj wants Amy to write to a woman on his behalf.

The Monster Isolation

After a bad date, Koothrappali decides to never leave his apartment; Penny's acting skills impress Sheldon.

The Rothman Disintegration

Sheldon and his rival Barry Kripke fight it out over the availability of a new office. Penny gets a gift from Amy that really tests their friendship and it doesn't end well.

The Toast Derivation

Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.

The Precious Fragmentation

When the guys find a ring from "The Lord of the Rings" at a garage sale, it threatens to tear them apart.

The Terminator Decoupling

Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress is on board the train they are taking to San Francisco.

The Tangerine Factor

Penny's break-up spurs Leonard to summon up the courage to ask her out, and each head to Sheldon for advice on their upcoming date.