The fifth TNG movie that never was

Spiner himself explained,...

https://memory-alpha.fandom.com/wiki/Undeveloped_Star_Trek_projects#Nemesis_follow-up

Undeveloped Star Trek projects

Many projects have been partially developed for Star Trek, beginning in the 1970s. There have also been deleted scenes for completed projects. The God Thing (1975) Star Trek: Planet of the Titans (1976-1977) Star Trek III (1980) Star Trek: The First Adventure (1989) Star Trek: IMAX (1997) Star Trek: The Beginning (2005) Star Trek 4 (alternate reality) (2019) The notion of a Star Trek film was originally considered amid the making of TOS Season 2, while DeForest Kelley, Gene Roddenberry, and Greg

Memory Alpha
“I can't imagine it would have been good, but boy do I wish I existed in a universe where this movie had been made.” — This is the perfect reaction and I cannot improve on it in any way.
The best way I have to describe this kind of movie is “delightfully terrible.”

I have a feeling that there are fans of Star Trek V The Final Frontier here.

The lesson should be that bizarre ideas for 5th movies should never be brought to screen.