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The Euclid Alternative is the fifth episode of the second season of The Big Bang Theory, and the twenty-second episode overall.
Johnny Galecki (Leonard Hofstadter),
Jim Parsons (Sheldon Cooper),
Kaley Cuoco (Penny),
Simon Helberg (Howard Wolowitz),
Kunal Nayyar (Rajesh Koothrappali)
Elena Campbell-Martinez (Maria),
Octavia Spencer (Octavia),
Livia Trevino (Lourdes)
Jaime Soria (DMV Customer)
Behind the Scenes
Allusions and References