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Star trek: The original series 1.03b - The enemy within

Stardate 1672.1
Threat advisory: High - High risk of entertaining activities

Episode propaganda

The Enterprise crew are engaged in a specimen gathering expedition on planet Alpha 177. When a crewmember is injured he beams back to the ship but the strange metallic ore covering his suit causes a transporter malfunction. When Kirk beams back to the ship, the transporter duplicates him, forming an evil alter ego and trapping the rest of the landing party on the planet...

Persons of interest

William Shatner .... Captain James Tiberius Kirk
Leonard Nimoy .... Commander Spock
Deforest Kelley .... Doctor Leonard H McCoy
James Doohan .... Lieutenant Montgomery Scott
Nichelle Nichols .... Lieutenant Uhura
George Takei .... Lieutenant Hikaru Sulu
Walter Koenig .... Ensign Pavel Andreievich Chekov
Majel Barrett .... Nurse Christine Chapel
Grace Lee Whitney .... Yeoman Janice Rand
Jim Goodwin .... Lieutenant John Farrell
Edward Madden .... Technician Fisher
Richard Matheson .... Screenwriter
Leo Penn .... Director

Cinematic intelligence sources

Studios and distributors:

Star trek official site

Intelligence analyst

Special Agent Matti

Intelligence report

Transporter malfunctions! Where would we be without them?

But seriously, folks, this is a good examination of the essence of human strife: the dichotomy of our conflicting desires. Finding the balance between the dark and the light is an interesting and worthy issue for a Star trek episode. Evil Jim is somewhat over the top, but I will assume that this is 60s directing, not Shat's acting: he's darned effective as the wimpy good Jim.

This episode forms the beginnings of Kirk's rejection of Sybok in the really, really bad Star trek movie, The final frontier because here Kirk has already found and embraced the divergent sides of his personality and found the reason for keeping them exactly the way they are. There's an interesting hint of Kirk's auto-eroticism when good Jim embraces evil Jim near the end of the episode, too.

The enemy within is especially significant because we get to see a lot of stuff from Sulu, freezing to death down on the planet, and it's the first time bones says "He's dead, Jim". It's also the first time you'll see the Vulcan neck pinch.