Duration: 22m
TV-PG 7.7 Comedy / Romance
The Big Bang Theory S4
In Season 4, Leonard and Penny's relationship becomes more complicated. The group explores personal growth while tackling scientific projects and quirky competitions.
Episode 1
Episode 2
Episode 3
Episode 4
Episode 5
Episode 6
Episode 7
Episode 8
Episode 9
Episode 10
Episode 11
Episode 12
Episode 13
Episode 14
Episode 15
Episode 16
Episode 17
Episode 18
Episode 19
Episode 20
Episode 21
Episode 22
Episode 23