To save money, Harve Bennett suggested replacing the Enterprise crew with younger actors.
Fans were eager for a glimpse of Spock’s home world, but it wasn’t until the movies that they got a better look.
Robert Fletcher named the movie’s many new alien races and provided background for each one.
The same sickbay set served four different starships.
Early drafts featured a Vulcan who kept changing sex, two young women who were attracted to older men and a navigation officer who was part polar bear.
Khan’s costume looked deliberately ragtag but also had to show off Ricardo Montalbán’s physique.