Screenwriting - I'm Not a Writer Anymore.

A few months after they filmed it, I checked the IMDB and I'm not listed as a writer anymore. The movie doesn't come out for like over a year so we never get to see it. We see that they took stuff out of our movie like the artistic stuff and the stuff that's most supposed to make you feel things because they didn't get that. So later on, and this is just an assumption the producer was listed as the. screenwriter then a made up name became one there. Then we threatened to sue and now we're listening story consultants. There's another aspect of screenwriting which I hesitate to even invoke because hopefully people don't have to deal with it