Movies that had scripts/planned but were never made

[Tempest]

What are some of the other movies that were planned or had scripts already but never were created and probably would of been great movies.

Examples:

- Willow 2, 3 - The Willow movie was suppose to be a trillogy with 3 movies. But only the first was ever made.

- Total Recall 2 - A script was created called Total Recall 2 but it was later heavily modified and turned into the movie Minority Report.