Jon Povill
Jonathan W. "Jon" Povill  was the associate producer of . He also received writing credit for the  second season episode , as it was based on the original script he co-wrote with Jaron Summers for the abandoned Star Trek: Phase II.

A fan of , Povill actually began his association with Star Trek by helping Gene Roddenberry move back into his Paramount office when the latter was attempting to write and produce a new Star Trek film in . Less than a year later, Povill – an up-and-coming screenwriter himself – was asked by Roddenberry to write his own treatment for a potential Star Trek film after Roddenberry's own script was rejected. Roddenberry felt Povill's story would be more suitable as a series episode than as a film, and the treatment was rejected. Later, however, Roddenberry asked Povill to collaborate with him on another film treatment, but this, too, was rejected by Paramount.

When work began on Star Trek: Phase II, Povill initially served as "assistant to the Producer" before being promoted to story editor based on his work on the script for "The Child", a planned episode for Phase II. Povill also co-wrote the Phase II series "bible" with Gene Roddenberry between May and August of . After it was decided that the two-hour pilot for the series would be turned into The Motion Picture, director Robert Wise made Povill the film's associate producer.

As noted by Robert Wise in the "Group Commentary" Special Feature of the Director's Edition DVD of Star Trek: The Motion Picture, Povill was responsible for coming up with several key elements that figured in the resolution of the movie. Specifically, while the story had always included the idea that V'Ger was seeking to find its creator, Povill added the reason for its search – that V'ger wanted to "join" with its creator in order to evolve to a higher plane of being. Povill devised V'Gers plan to immediately join with whatever being entered the correct identification code in its ground test computer. The "fusion" of V'Ger, Decker, and Ilia came from Povill. 

The origin of the Klingon language can be traced back to an afternoon in Povill's office when he and James Doohan simply made up the Klingon words necessary for the opening of Star Trek: The Motion Picture. 

Povill recounted his experiences with Star Trek and his brief period at Paramount in the three-page introduction to Star Trek Phase II: The Lost Series, written by Judith and Garfield Reeves-Stevens. The Phase II "bible" is also reprinted in the book, as is the revised draft of Povill and Summers' script for "The Child".

Fifteen years after leaving Star Trek behind, Povill became a producer and script consultant on the popular science fiction series Sliders, which starred  guest actor John Rhys-Davies. Povill is also among those credited with the screen story for the 1990 sci-fi/action film Total Recall, the screenplay for which Povill wrote back in 1975 shortly before joining Roddenberry at Paramount. Total Recall ended up featuring Trek alumni Marc Alaimo, Roy Brocksmith, Robert Costanzo, Ronny Cox, Mel Johnson, Jr., Frank Kopyc, and Robert Picardo, and became the seventh highest-grossing movie of the year.

Povill is married to Michele Ameen Billy, whom he met on the set of Phase II and who ultimately appeared in The Motion Picture. They have two sons, Andrew and Sean. In 2001 he was interviewed for the special feature Phase II: The Lost Enterprise on the Star Trek: The Motion Picture (The Director's Edition) DVD.

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