Star Trek pushed the boundaries of what was acceptable on network television in the 1960s. Several episodes broke new ground in representation, social commentary, and controversial content — often fighting network censors every step of the way.
The Season 3 episode "Plato's Stepchildren" (aired November 22, 1968) is often cited as the first scripted interracial kiss on U.S. television. It aired one year after the Supreme Court struck down laws banning interracial marriage in Loving v. Virginia (1967) [1].
NBC was deeply concerned about backlash from Southern TV stations. They ordered two versions be filmed: one with the kiss and one without [1].
William Shatner and Nichelle Nichols deliberately sabotaged the non-kiss version. In every take without the kiss, Shatner wildly crossed his eyes or flubbed his lines. As Nichols recounted: "Kirk and Uhura fought it, they did kiss in every single scene. When the non-kissing scene came on, everyone in the room cracked up." The unusable take forced NBC to use the kiss version [1][2].
Shatner confirmed in a 2024 interview with Bill Maher: "It would not have got done" without his insistence [2].
Despite fears, there was almost zero public backlash. Nichols received one of the largest batches of fan mail the show ever received. The single negative letter was from a white Southerner who wrote: "I am totally opposed to the mixing of the races. However, any time a red-blooded American boy like Captain Kirk gets a beautiful dame in his arms that looks like Uhura, he ain't gonna fight it" [1].
Featured two aliens from the planet Cheron — one black on the left side/white on the right, the other the reverse — who fight to the death over their superficial pigmentation difference, destroying their entire planet in the process. A blunt but powerful allegory for racial hatred that remains relevant today [3].
Featured a Nazi regime on an alien planet. Did not air in Germany until 1995 due to the swastika imagery and the portrayal of Nazism. Leonard Nimoy (who was Jewish) refused to appear in on-set promotional photographs wearing a Nazi uniform, as he was participating in a children's Hanukkah service that same year [4].
Four episodes were banned by the BBC for nearly 20 years because they "dealt most unpleasantly with already unpleasant subjects of madness, torture, sadism and disease." "The Empath," "Whom Gods Destroy," "Plato's Stepchildren," and "Miri" were not aired until 1994 [4].
Featured extremely revealing costumes that forced NBC's Broadcast Standards to demand the exercise scenes be trimmed to about ten seconds [5].
The Kirk/Uhura kiss was a watershed moment in television representation. Nichelle Nichols went on to work with NASA in the 1970s and '80s, recruiting women and minority astronauts for the space program — including Mae Jemison, the first African-American woman in space, who cited Nichols as her inspiration [6].
Roddenberry's vision of a diverse future crew — with a Japanese helmsman, a Russian navigator, an African-American communications officer, and a Vulcan science officer — was radical for 1966 America. The show demonstrated that audiences would accept (and embrace) a multiracial, multinational team working together toward common goals, paving the way for decades of diverse casting in science fiction and beyond [6].
[1] Wikipedia - Kirk and Uhura's Kiss
[2] AP News - Star Trek's Interracial Kiss
[3] Grokipedia - Let That Be Your Last Battlefield
[4] Den of Geek - Star Trek BBC Bans and Censorship