John Kingsbridge
John Kingsbridge  was the pen name of writer John T. Dugan. He wrote the  second season episode . In  he earned a Writers Guild of America Award nomination for his Star Trek contribution.

Dugan chose to be credited under his Kingsbridge pseudonym because he was dissatisfied with Gene Roddenberry's rewrite on his script. Roddenberry's version had Sargon and Thalassa fading away into oblivion at the end of the episode, which went against Dugan's Catholic beliefs. (These Are the Voyages: TOS Season Two)

Dugan, again writing as Kingsbridge, went on to co-write an episode of the NBC television series Mission: Impossible entitled "The Vault" along with  co-writer Judy Burns. Also writing as Kingsbridge, he co-wrote the 1969 film Shark! and served as a writer on Adam-12 and Doc Elliot.

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Writers
Writers Guild of America Award nominees