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Star Trek S1E5 — The Enemy Within
7.6
Star Trek•Season 1•Episode 5

The Enemy Within

7.6/10 · 5,830 votesOct 6, 196650 min

Ranked #15 of 29 in Season 1•matches the season avg

Discussion

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.

Directed byLeo Penn
Written byRichard Matheson
Previous episodeE4 · The Naked TimeNext episodeE6 · Mudd's Women
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Seasons3

All123

Season 1 Episodes29

The Man Trap stillE1 7.2

The Man Trap

Charlie X stillE2 7.0

Charlie X

Where No Man Has Gone Before stillE3 7.7

Where No Man Has Gone Before

The Naked Time stillE4 7.8

The Naked Time

The Enemy Within stillE5 7.6Now viewing

The Enemy Within

Mudd's Women stillE6 6.7

Mudd's Women

What Are Little Girls Made Of? stillE7 7.5

What Are Little Girls Made Of?

Miri stillE8 6.9

Miri

Dagger of the Mind stillE9 7.4

Dagger of the Mind

The Corbomite Maneuver stillE10 8.0

The Corbomite Maneuver

The Menagerie (1) stillE11 8.2

The Menagerie (1)

The Menagerie (2) stillE12 8.1

The Menagerie (2)

The Conscience of the King stillE13 7.1

The Conscience of the King

Balance of Terror stillE14 8.8

Balance of Terror

Shore Leave stillE15 7.3

Shore Leave

The Galileo Seven stillE16 7.6

The Galileo Seven

The Squire of Gothos stillE17 7.2

The Squire of Gothos

Arena stillE18 7.9

Arena

Tomorrow Is Yesterday stillE19 7.9

Tomorrow Is Yesterday

Court Martial stillE20 7.4

Court Martial

The Return of the Archons stillE21 7.1

The Return of the Archons

Space Seed stillE22 8.7

Space Seed

A Taste of Armageddon stillE23 8.0

A Taste of Armageddon

This Side of Paradise stillE24 7.8

This Side of Paradise

The Devil in the Dark stillE25 8.3

The Devil in the Dark

Errand of Mercy stillE26 8.1

Errand of Mercy

The Alternative Factor stillE27 5.7

The Alternative Factor

The City on the Edge of Forever stillE28 9.2

The City on the Edge of Forever

Operation: Annihilate! stillE29 7.5

Operation: Annihilate!

Cast6

William Shatner

William Shatner

James T. Kirk

Leonard Nimoy

Leonard Nimoy

Spock

DeForest Kelley

DeForest Kelley

Dr. McCoy

James Doohan

James Doohan

Scott

George Takei

George Takei

Sulu

Nichelle Nichols

Nichelle Nichols

Uhura

Crew12

Richard Matheson

Richard Matheson

Writer

Leo Penn

Leo Penn

Director

G

Gerald Perry Finnerman

Director of Photography

S

Sol Kaplan

Music

F

Fabien D. Tordjmann

Editor

W

Walter M. Jefferies

Art Direction

R

Rolland M. Brooks

Art Direction

W

William Ware Theiss

Costume Design

J

Jim Rugg

Special Effects

C

Carl Biddiscombe

Set Decoration

F

Fred B. Phillips

Makeup Artist

V

Virginia Darcy

Hairstylist

Discussion

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Episode Summary

"The Enemy Within" is episode 5 of Star Trek season 1. It scored 7.6/10 from 5,830 votes, ranking #15 of 29 episodes this season (season average 7.6). Directed by Leo Penn and written by Richard Matheson, it aired on October 6, 1966.

Next: E6 · Mudd's WomenBest of Season 1