In November of 1980, Bennett wrote his first outline for a Star Trek sequel, War of the Generations. While en route to a rebellion on a Federation world, the Enterprise rescues a woman that Admiral Kirk had once been in love with and discovers that their son (whom he had no idea existed) was one of the rebel leaders. He arrives at the planet and is promptly captured and sentenced to death by his progeny before the audience learns that the mastermind behind the whole planetary conflagration is Khan.
Once Khan’s identity and motives are revealed, Kirk and his son team up against the genetically augmented leader and after defeating him, the younger man joins the crew of the Enterprise.
While War of the Generations bears almost no resemblance to the final movie, some themes and elements were carried through multiple drafts: Kirk met a son he never knew, Spock was preoccupied with death and McCoy had feelings for a younger woman — someone who had made it clear that she was also interested in the doctor.