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The Friendship Algorithm is the thirteenth episode of the second season of The Big Bang Theory, and the thirtieth episode overall.
Johnny Galecki (Leonard Hofstadter),
Jim Parsons (Sheldon Cooper),
Kaley Cuoco (Penny),
Simon Helberg (Howard Wolowitz),
Kunal Nayyar (Rajesh Koothrappali)
Will Deutsch (Jeremy),
Jane Galloway Heitz (Mildred),
Jane Zdanow (Rebecca)
Behind the Scenes