(1966-1969, Created by Gene Roddenberry, starring William Shatner, Leonard Nimoy, DeForest Kelley, Nichelle Nichols, James Doohan, George Takei, Walter Koenig, and Majel Barrett; TV-PG)
S3.E15 Captain Kirk is forced to take desperate action when warring alien factions meet for a decisive battle aboard the Enterprise. An article in The New Yorker noted that this episode was a dramatization about slavery and racism, and it has been ranked among the most optimistic episodes of the series for the way the crew reacted to the obvious bigotry between the two nearly identical aliens.