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The Bad Fish Paradigm

Episode number: 1

Overview: Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.

The Codpiece Topology

Episode number: 2

Overview: A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.

The Barbarian Sublimation

Episode number: 3

Overview: Sheldon creates a monster when he introduces Penny to online gaming.

The Griffin Equivalency

Episode number: 4

Overview: Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.

The Euclid Alternative

Episode number: 5

Overview: Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.

The Cooper-Nowitzki Theorem

Episode number: 6

Overview: Sheldon and the gang are confused when a young grad student is attracted to him.

The Panty Piñata Polarization

Episode number: 7

Overview: When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.

The Lizard-Spock Expansion

Episode number: 8

Overview: Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.

The White Asparagus Triangulation

Episode number: 9

Overview: Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.

The Vartabedian Conundrum

Episode number: 10

Overview: Leonard asks Penny for advice when his new relationship starts moving too fast.

The Bath Item Gift Hypothesis

Episode number: 11

Overview: Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.

The Killer Robot Instability

Episode number: 12

Overview: Penny's criticism of Wolowitz's romantic life pushes him into depression and AWOL for a fighting robot battle the rest of guys are depending on him for.

The Friendship Algorithm

Episode number: 13

Overview: Sheldon creates a scientific procedure for making friends.

The Financial Permeability

Episode number: 14

Overview: Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.

The Maternal Capacitance

Episode number: 15

Overview: Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.

The Cushion Saturation

Episode number: 16

Overview: A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.

The Terminator Decoupling

Episode number: 17

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

The Work Song Nanocluster

Episode number: 18

Overview: Penny's home business turns into a complete nightmare when Sheldon takes over.

The Dead Hooker Juxtaposition

Episode number: 19

Overview: Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."

The Hofstadter Isotope

Episode number: 20

Overview: A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.

The Vegas Renormalization

Episode number: 21

Overview: Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.

The Classified Materials Turbulence

Episode number: 22

Overview: Penny's second date with Stuart sees her making a comment that gives Leonard new hope for a relationship with her. Wolowitz realizes there's a crucial error in a NASA project he's working on.

The Monopolar Expedition

Episode number: 23

Overview: The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.