Sequels to films that never were

[Alex]

Yeah, I'm a bit fuzzy on the idea here. If I understand correctly it is essentially this:

The creator of a new work chooses to delve into the later exploits of existing characters but completely independent of that original creation. Kind of like if I sat here and wrote the screenplay to Crocodile Dundee IV.

If so, I'd question Return to Oz because while it may be completely separated from The Wizard of Oz as a movie it is still an amalgmation of two of L. Frank Baum's sequel novels.

Hook, I can see. I'm not immediately coming up with another movie but the first thing that comes to are books that do a similar thing in taking a work in the public domain and writing the a sequel. Like the Gone with the Wind sequel written years back. After his death there was a mini cottage industry of other authors writing novels set in Isaac Asimov's Robots/Foundation universe using their own personal style, but those weren't entirely segregated.

[BarTopDancer]

So basically a sequel to a film that never was would be a movie based upon a film with completely different canon?

[Tref]

I always thought the Kaufman remake of Invasion of the Body Snatchers was technically a sequel because it begins where the original ended, with Kevin McCarthy (as Dr. Miles J. Bennell) warning people that, "They're here!"