An alien child grows inside the Enterprise computer and considers Kirk a father figure.
Kirk, Spock and McCoy are kidnapped by aliens and replaced by androids.
Gene Coon rejected this two-part episode, which would have taken place on a long-lost generation ship, but encouraged the author, David Gerrold, to pitch more ideas.
Robert Silverberg wrote a Star Trek movie in which Kirk and his crew search for an ancient civilization known as the Great Ones.
The Enterprise is held captive by the image of Albert Einstein.
A being claiming to be a nineteenth-century English lord seduces a member of the Enterprise crew.