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The Enemy Within
Production Number 05
Air Date (US) 1966-10-06
Season 1
DVD Disc No. 2
Watch Episode Trailer (.mov QuickTime format - 2.522 MB)  
William Shatner as James T. Kirk
Leonard Nimoy as Spock
DeForest Kelley as Leonard H. McCoy
James Doohan as Montgomery Scott
Nichelle Nichols as Uhura
George Takei as Hikaru Sulu

Guest Cast:
Grace Lee Whitney as Yeoman Janice Rand
Jim Goodwin as Lt. John Farrell
Edward Madden as Tech. Fisher

Creative Staff:
Director: Leo Penn
Written By: Richard Matheson
While orbiting the planet Alfa 177, the U.S.S. Enterprise experiences a transporter malfunction when Technician Fisher is beamed up from the planet with some magnetic ore on his clothing. Scotty checks the transporter and finds nothing wrong, so Captain Kirk beams aboard. Kirk leaves with his officers and when the transporter room is deserted, a second Kirk materializes on the pad.
When a space animal is beamed aboard the starship and splits into two entities; one tame and one vicious, it is discovered that the same thing has happened to Kirk. While one Kirk is good and honorable, the other is evil and runs amok on his ship, committing violent acts, including the attempted assault of Yeoman Janice Rand.

Meanwhile, the transporter continued to split objects into two entities, thus forcing the remainder of the ship's landing party to remain on the planet's surface. Alfa 177's approaching night promises certain death from exposure and freezing temperatures to the unprotected landing party.

As time passes, the "good" Kirk is weakening, losing his ability to make decisions, while his "evil" half is dying. Neither Kirk can survive without his other half. Time is running out, not only for Captain Kirk, but for the landing party on the planet's surface.

Scotty effects repairs on the transporter, but there's no time to test it. McCoy is fearful because the "space dog" which had been split earlier, had gone through the repaired transporter and, while joined into one animal, was dead. Kirk takes the chance and beams down with his counterpart and returns to the U.S.S. Enterprise whole and alive. Quickly the landing party is beamed aboard, worse for the cold, but alive.
Leonard Nimoy devised the FVNP (Famous Vulcan Nerve Pinch) for this episode, believing that Spock would not hit the captain with the butt of his phaser.
Note that when the two Kirks beam in, neither is wearing an insignia, but when we see them later, they are! Watch for Sulu using his phaser to heat the rocks... it's the only time we see a phaser firing multiple beams.




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