The Big Bang Theory/The Helium Insufficiency
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The Helium Insufficiency is the sixth episode of the ninth season of The Big Bang Theory, and the one hundred eighty-ninth 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), Kevin Sussman (Stuart Bloom)
and Michael Rapaport (Kenny)
Co-Starring: Elena Campbell-Martinez (Maria)