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The Big Bang Theory

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Episode Guide

#
Name
Air Date
83.
The Prestidigitation Approximation
Leonard has to choose between Penny and his new girlfriend, Priya; Howard's magic trick drives Sheldon crazy.
03-10-2011
82.
The Toast Derivation
Sheldon is upset when he realizes Leonard is the center of their group of friends.
02-24-2011
81.
The Cohabitation Formulation
Wolowitz considers taking things with Bernadette to the next level; Leonard and Raj's sister rekindle their relationship.
02-17-2011
80.
The Benefactor Factor
A wealthy donor makes Leonard question what he is willing to do for science.
02-10-2011
79.
The Thespian Catalyst
Sheldon takes acting lessons from Penny in hope of becoming a better teacher; Koothrappali fantasizes about his friend's girlfriend.
02-03-2011
78.
The Love Car Displacement
Bernadette runs into her ex-boyfriend (Rick Fox) while attending a science event with Wolowitz.
01-20-2011
77.
The Bus Pants Utilization
Leonard's idea for a smartphone application causes friction in his friendship with Sheldon.
01-06-2011
76.
The Justice League Recombination
The guys try to bond with Penny's new boyfriend through a costume contest.
12-16-2010
75.
The Alien Parasite Hypothesis
Amy realizes she has feelings for Penny's ex; Koothrappali and Wolowitz try to prove who would be a better superhero.
12-09-2010
74.
The Boyfriend Complexity
Penny asks Leonard to lie to her father (Keith Carradine); Howard, Raj and Bernadette pull an all-nighter at a telescope.
11-18-2010
81-90 of 163
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