Title: Patterns of Force
Season: TOS2
Production Number: ST:TOS 52
Original Airdate: 2/16/1968
Stardate: 2534.0
Synopsis:
The U.S.S. Enterprise investigates the disappearance of an old Academy professor of Kirk's—John Gill. Kirk and Spock discover that Gill had "gone native" and violated the Prime Directive by patterning the planet of Ekos after Nazi Germany prior to World War II. It was Gill's belief that, under the right direction, this type of patriotism could be used to positive purpose in the advancement of the planet's culture. The results turn out to be disastrous—the Ekosian people turn on their neighbors, the Zeons, and place John Gill in the role of the Fuhrer! When Kirk and Spock reveal a power-seeking Ekosian has been controlling Gill, they are able to help him recall a large scale attack and begin the process of restoring peace to both cultures.
Credits:
Cast:

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
Walter Koenig as Pavel Andreievich Chekov

Guest Cast:

David Brian as John Gill
Skip Homeier as Melakon
Richard Evans as Isak
Valora Norland as Daras
William Wintersole as Abrom

Creative staff:

Director: Vincent McEveety
Written By: John Meredyth Lucas