Episode 51 A Private Little War / Second Skin. Eric appreciates Dr. McCoy's speeches all the more in this Vietnam inspired TOS and Bob is all about the identity crisis and spy influenced plot on DS9. Ratings: A Private Little War - Eric 8.5, Bob 7. Second Skin - Bob 9, Eric 7.75.
If you woke up wearing another person's face would it make you crack eventually and lose you sense of identity? Moreso If this new life was better off than your own would you pretend to go along with it to take advantage and sell yourself out so to speak?