Episodes
E1 · The Bad Fish Paradigm
2008 · 22m · 7.8 TMDB
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
E2 · The Codpiece Topology
2008 · 21m · 7.6 TMDB
A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
E3 · The Barbarian Sublimation
2008 · 21m · 7.9 TMDB
Sheldon creates a monster when he introduces Penny to online gaming.
E4 · The Griffin Equivalency
2008 · 21m · 7.6 TMDB
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
E5 · The Euclid Alternative
2008 · 20m · 7.6 TMDB
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
E6 · The Cooper-Nowitzki Theorem
2008 · 21m · 7.8 TMDB
Sheldon and the gang are confused when a young grad student is attracted to him.
E7 · The Panty Piñata Polarization
2008 · 21m · 7.9 TMDB
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
E8 · The Lizard-Spock Expansion
2008 · 20m · 7.4 TMDB
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
E9 · The White Asparagus Triangulation
2008 · 21m · 7.4 TMDB
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
E10 · The Vartabedian Conundrum
2008 · 21m · 7.0 TMDB
Leonard asks Penny for advice when his new relationship starts moving too fast.
E11 · The Bath Item Gift Hypothesis
2008 · 21m · 8.2 TMDB
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
E12 · The Killer Robot Instability
2009 · 21m · 7.5 TMDB
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.
E13 · The Friendship Algorithm
2009 · 21m · 7.5 TMDB
Sheldon creates a scientific procedure for making friends.
E14 · The Financial Permeability
2009 · 21m · 7.4 TMDB
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
E15 · The Maternal Capacitance
2009 · 21m · 8.2 TMDB
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
E16 · The Cushion Saturation
2009 · 21m · 7.5 TMDB
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
E17 · The Terminator Decoupling
2009 · 21m · 7.6 TMDB
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.
E18 · The Work Song Nanocluster
2009 · 20m · 7.6 TMDB
Penny's home business turns into a complete nightmare when Sheldon takes over.
E19 · The Dead Hooker Juxtaposition
2009 · 20m · 7.6 TMDB
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
E20 · The Hofstadter Isotope
2009 · 20m · 7.6 TMDB
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
E21 · The Vegas Renormalization
2009 · 22m · 7.5 TMDB
Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
E22 · The Classified Materials Turbulence
2009 · 19m · 7.5 TMDB
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.
E23 · The Monopolar Expedition
2009 · 21m · 7.5 TMDB
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.
