The Big Bang Theory/The Tangible Affection Proof
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The Tangible Affection Proof is the sixteenth episode of the sixth season of The Big Bang Theory, and the one hundred twenty-seventh 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), Mayim Bialik (Dr. Amy Farrah Fowler), Melissa Rauch (Dr. Bernadette Rostenkowski-Wolowitz)
Co-Starring: Briana Cuoco (Gretchen)