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The Big Bang Theory/The Zazzy Substitution
From The TV IV
| The Zazzy Substitution | |
| Season 4, Episode 3 | |
| Airdate | October 7, 2010 |
| Production Number | 3X6653 |
| Teleplay by | Lee Aronsohn & Steven Molaro & Maria Ferrari |
| Story by | Chuck Lorre & Bill Prady & Jim Reynolds |
| Directed by | Mark Cendrowski |
| ← 4x02 The Cruciferous Vegetable Amplification |
4x04 → The Hot Troll Deviation |
| The Big Bang Theory — Season Four | |
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The Zazzy Substitution is the third episode of the fourth season of The Big Bang Theory, and the sixty-sixth episode overall.
Starring: Johnny Galecki (Dr. Leonard Hofstadter), Jim Parsons (Dr. Sheldon Cooper), Kaley Cuoco (Penny), Simon Helberg (Howard Wolowitz), Kunal Nayyar (Dr. Rajesh "Raj" Koothrappali)
Special Guest Star: Laurie Metcalf (Mary)
Guest Starring: Mayim Bialik (Amy)
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