Aired Tuesday June 18, 1:00pm - 1:30pmon E4

The Big Bang Theory

Series 4 Episode 3: The Zazzy Substitution

The guys are concerned when Sheldon searches for an alternative to human companionship after he and Amy break up. Can they help restore his faith in people? Meanwhile, when things take a turn for the worse and Sheldon starts bulk buying pet cats, Leonard gets Sheldon's mum to pay him a visit.

Original air date
Cast and crew
  • Mark CendrowskiDirector
  • Johnny GaleckiLeonard Hofstadter
  • Jim ParsonsSheldon Cooper
  • Kaley CuocoPenny
  • Simon HelbergHoward Wolowitz
  • Kunal NayyarRaj Koothrappali
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