The Big Bang Theory/The Retraction Reaction
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The Retraction Reaction is the second episode of the eleventh season of The Big Bang Theory, and the two hundred thirty-third episode overall.
Starring: Johnny Galecki (Dr. Leonard Hofstadter), Jim Parsons (Dr. Sheldon Cooper), Kaley Cuoco (Penny Hofstadter), Simon Helberg (Howard Wolowitz), Kunal Nayyar (Dr. Rajesh "Raj" Koothrappali), Mayim Bialik (Dr. Amy Farrah Fowler), Melissa Rauch (Dr. Bernadette Rostenkowski-Wolowitz)
Special Guest Star: Regina King (Mrs. Davis)
Co-Starring: Ira Flatow (Himself)