Star Trek
Season 1, Episode 5: The Enemy Within
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Split by a transporter malfunction into two beings with very different personalities, the resulting twin Captain Kirk proves that neither a purely evil nor a sweetly good captain can survive without the missing half.
All Episodes - Season 1
Episode 1
The Man Trap
Episode 2
Charlie X
Episode 3
Where No Man Has Gone Before
Episode 4
The Naked Time
Episode 5
The Enemy Within
Episode 6
Mudd's Women
Episode 7
What Are Little Girls Made Of?
Episode 8
Miri
Episode 9
Dagger of the Mind
Episode 10
The Corbomite Maneuver
Episode 11
The Menagerie (1)
Episode 12
The Menagerie (2)
Episode 13
The Conscience of the King
Episode 14
Balance of Terror
Episode 15
Shore Leave
Episode 16
The Galileo Seven
Episode 17
The Squire of Gothos
Episode 18
Arena
Episode 19
Tomorrow Is Yesterday
Episode 20
Court Martial
Episode 21
The Return of the Archons
Episode 22
Space Seed
Episode 23
A Taste of Armageddon
Episode 24
This Side of Paradise
Episode 25
The Devil in the Dark
Episode 26
Errand of Mercy
Episode 27
The Alternative Factor
Episode 28
The City on the Edge of Forever
Episode 29
Operation: Annihilate!