The Big Bang Theory

Brilliant physicists Leonard and Sheldon meet new neighbour Penny, who shows them that although they're smart, they know very little about real life. S1, Ep1

Leonard volunteers to sign for a package to make a good impression on Penny, but things go terribly awry when he enlists Sheldon for help. S1, Ep2

Leonard is depressed to learn that Penny is dating someone. Encouraged by his friends and fellow scientists, he asks a colleague out on a date. S1, Ep3

Sheldon gets fired and explores what life has to offer outside physics, leaving Leonard to take drastic action to snap his friend out of his funk. S1, Ep4

Fearing he's wasting his time on Penny, Leonard makes a connection with Leslie. Meanwhile, Sheldon frets over a change to his hamburger routine. S1, Ep5

Penny hosts a Halloween party, putting Leonard, Sheldon, Wolowitz and Koothrappali through a new test of their social skills. S1, Ep6

When Wolowitz goes AWOL with one of her friends, Penny's recruited to fill in for him on the guys' Halo team. S1, Ep7

Raj's parents set him up on a blind date, and when he discovers he can talk to her, she shows interest in Sheldon. S1, Ep8

Cooper-Hofstadter Polarization. When they're invited to present at a physics conference, Sheldon's reluctance to share the credit leads to a tiff between him and Leonard. S1, Ep9

Leonard and Sheldon each lie to avoid hearing Penny sing in a production of Rent. However, Sheldon's lie becomes a bit too complicated. S1, Ep10

With his friends knowing how sour he acts when sick and avoiding him as a result, Sheldon is nursed by Penny, who hasn't a clue what she's in for. S1, Ep11

With Sheldon rattled after meeting Dennis, a teen physicist who's smarter than he is, the rest of the guys search for a way to eliminate the threat. S1, Ep12

Sheldon finds himself booted from the gang's Physics Bowl team and replaced with Leslie, so he forms his own team hoping to prove he's superior. S1, Ep13

When the delivery of a full-size prop of 1960's 'The Time Machine' causes Penny to miss work, she scolds Leonard about his sci-fi collectibles. S1, Ep14