Stardate 50693.2: After her break-up with Neelix, Kes falls in love with the Mikhal Traveler Zahir at a trading outpost. She thinks about leaving Voyager to stay with Zahir. The Doctor begins to improve his program, adding behavioral subroutines based on historical figures such as Mahatma Gandhi, Lord Byron, T'Pau of Vulcan and Socrates. One night near the outpost, Zahir is assaulted by an unidentified person. Unbeknown to anyone, the "dark sides" of the personalities the Doctor incorporated temporarily take control of his program. When B'Elanna discovers that the Doctor's program is destabilizing due to the recent additions, the Doctor's evil side takes over. He disables B'Elanna, simulating an anaphylactic shock. He then kidnaps Kes and beams down to the planet with her. In the meantime, Tuvok has found evidence that Zahir's attacker was a hologram. Chakotay, Tuvok and Zahir confront the Doctor and Kes on a mountain trail. Kes tries to convince the Doctor that both the good and the evil side can be saved. When they plunge down, they are saved with the transporter, and the Doctor's evil part of the program is eliminated.

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