The Big Bang Theory/The Boyfriend Complexity
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The Boyfriend Complexity is the ninth episode of the fourth season of The Big Bang Theory, and the seventy-second 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)
Special Guest Star: Keith Carradine (Wyatt)