The Big Bang Theory/The Engagement Reaction
From The TV IV
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The Engagement Reaction is the twenty-third episode of the fourth season of The Big Bang Theory, and the eighty-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), Melissa Rauch (Bernadette Rostenkowski)
Co-Starring: Sharon Omi (Nurse in Biohazard Suit)