Sheldon's getting fired forces him to explore what life has to offer outside physics, leaving Leonard to take drastic action to snap his friend out of his funk. ..More

Fearing he's wasting his time on Penny, Leonard ends up making a connection with Leslie. Meanwhile, Sheldon frets over a change to his hamburger routine. ..More

Penny hosts a Halloween party putting Leonard, Sheldon, Wolowitz and Koothrappali through a new test of their social skills. ..More

With Wolowitz AWOL with one of her friends, Penny's recruited to fill in for him on the guys' Halo team. ..More

Raj's parents set him up on a blind date, and when he discovers he can talk to her, she shows interest in Sheldon. ..More

Sheldon is overexuberant that Leonard finally has a girlfriend matching his high standards. ..More

Leonard seeks Penny's counsel when his relationship with Stephanie takes off faster than he'd like. Sheldon's hypochondriac tendencies get the better of him. ..More

Sheldon irks the gangs with his obsession with proper Christmas gift protocol. Leonard's crushed when Penny dates a colleague of his. ..More