Source: SYFY WIRE
People have an oversimplified idea of how movies are made: A script is written, performers are cast, the movie is shot, and then everyone sits around doing tons of drugs while waiting for awards season.
The reality of show business is much more complicated. A project can come and go for years before anyone ever says, "yes, we're making this thing happen" -- and by then it might have mutated into a completely different beast. What began life as a prequel to Pangolin Man may become the seventh entry in the Armadillo Warriors series. In fact, a movie or show can win, lose, or change its franchise several times along the way. For example:
Source: Film School Rejects