Ilia would have been a permanent addition to the Enterprise crew in Star Trek: Phase II.
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.
A mysterious being challenges the Enterprise crew to prove themselves worthy of “attaining the all”.
Two visions produced for the aborted Star Trek television series Phase II would go on to inform The Next Generation.