Since 1964 (yep) there have been Star Trek projects that simply didn't make it to the big or small screen. And before Star Trek's second (proper) coming in 1979's Star Trek: The Motion Picture, the franchise had more than its fair share of attempts to come to life, and then be reborn.
This lot in fact...
Star Trek – The (original) Original Series
Here's a thought – the original Star Trek series wasn't supposed to be the original Star Trek series.
The pilot that sold the show to NBC was in fact the second pilot, after the original, entitled The Cage, filmed at the end of 1964, was deemed too cerebral. That's on top of having other multiple issues that TV executives (and test audiences) of the time couldn't cope with – you know, like gender equality in the workplace.