The Enemy Within (Episode)

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Star Trek, Season 1, Episode 4
Star Trek
Executive Producer Gene Roddenberry
Producer Gene Coon
Associate Producers Robert Justman and John D.F. Black
Created by Gene Roddenberry
"The Enemy Within"
Episode 04
Released 6 October 1966
Director Leo Penn
Writer Richard Matheson

Stardate 1672.1: A transporter malfunction creates an evil Kirk.

In orbit of Alfa 117, the Enterprise 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 lacking mentally and emotionally. 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.

Related Data

Astrometrics Alfa 177
Cast & Crew Doohan, James; Goodwin, Jim; Kelley, DeForest; Madden, Edward; Matheson, Richard; Nichols, Nichelle; Nimoy, Leonard; Paskey, Eddie; Penn, Leo; Shatner, William; Takei, George; Thompson, Garland; Whitney, Grace Lee
Chronology Stardate 1672.1-1673.5; 2266
Culture skiing
Education doctor
Food coffee; rice wine; Saurian brandy
People Connors, James; Farrell, John; Fisher; James; Kirk, James T.; McCoy, Leonard; Rand, Janice; Scott, Montgomery; Spock; Sulu, Hikaru; Uhura, Nyota; Wilson
Politics Starfleet; Starfleet Ranks; United Federation of Planets; Yeoman
Science & Technology computer; frostbite; geology; impulse drive; magnetic ore; phaser; tranquilizer transporter; tricorder; warp drive; warp nacelle
Ships & Vehicles Constitution class; U.S.S. Enterprise NCC-1701
Xenology Alfa 177 canine; Humans; Vulcans
Miscellaneous Vulcan nerve pinch
Star Trek, Season 1, Episode 4