The Enemy Within (Episode)

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"The Enemy Within"
"The Enemy Within"

"The Enemy Within"
Series Star Trek
Season 1
Episode 5
Production Number 05

Previous Mudd's Women (TOS04)
Next The Man Trap (TOS06)
Released 6 Oct 1966
Prime Timeline
(The root of all realities)

Stardate 1672.1: A transporter malfunction creates an evil Kirk.

In orbit of Alfa 177, the U.S.S. Enterprise NCC-1701 experiences a momentary transporter malfunction, caused by a magnetic ore accidentally brought aboard. Scotty checks the equipment, finds nothing wrong, and beams aboard Captain Kirk. After they leave the transporter room, a duplicate Kirk materializes. The malfunction has split the captain into two people, each physically identical but mentally and emotionally distinct. The "good" Kirk is compassionate, intelligent, and deliberate. The "bad" Kirk is violent, amoral, and savage.

An animal beamed aboard the Enterprise shortly thereafter is divided into two creatures as well—and after Yeoman Rand accuses the captain of assaulting her, Spock realizes the same has happened to Kirk. The transporter malfunction must be repaired shortly or a stranded landing party, led by Sulu, will freeze to death on the planet's surface.

The captain, meanwhile, is dying—neither half can survive alone. Scotty rigs the transporter to run through the impulse drive, and after capturing the "bad" Kirk, beams both captains down—and back as a single person. The restored Kirk then orders the landing party rescued.

Image Gallery

Related Data


William Shatner

Also Starring
Leonard Nimoy as Mr. Spock

Directed by
Leo Penn

Written by
Richard Matheson

Created and Produced by
Gene Roddenberry

Associate Producers
Robert H. Justman and John D.F. Black

Director of Photography
Jerry Finnerman

Art Directors
Roland M. Brooks, Walter M. Jefferies

Theme Music by
Alexander Courage

Music Composed and Conducted by
Sol Kaplan

DeForest Kelley as Dr. McCoy

Grace Lee Whitney as Yeoman Rand


George Takei as Sulu
James Doohan as Scott
Edward Madden as Fisher
Garland Thompson as Wilson
Jim Goodwin as Farrell

Film Editor
Fabien Tordjmann

Assistant to the Producer
Edward K. Milkis

Assistant Director
Gregg Peters

Set Decorator
Carlk F. Biddiscombe

Costumes Created by
William Theiss

Post Production Executive
Bill Heath

Music Editor
Robert H. Raff

Sound Editor
Joseph G. Sorokin

Sound Mixer
Jack F. Lilly

Photographic Effects
Howard Anderson Co.

Script Supervisor
George A. Rutter

Music Consultant
Wilbur Hatch

Music Coordinator
Julian Davidson

Special Effects
Jim Rugg

Property Master
Irving A. Feinberg

George H. Merhoff

Head Grip
George Rader

Production Supervisor'
Bernard A. Widin

Makeup Artist
Fred B. Phillips, S.M.A.

Hair Styles by
Virginia Darcy, C.H.S.

Wardrobe Mistress
Margaret Makau

Joseph D'Agosta

Glen Glenn Sound Co.

A Desilu Production

In Association with
Norway Corporation

Executive in Charge of Production
Herbert F. Solow