A book that's been made in to a movie, or tv series, books based on Tv or a movie. Sometimes the differences are very sutble, other times, they're huge. Which do you prefer to write from? Does grabbing bits from both work? Do they count as two, or more, different fandoms?
For example; Dresden Files book 'verse- Bob's a skull, Murphey's blonde, and his blasting rod isn't a hockey stick.
A side question: movies made from books, do you read the book first, or see the movie?
I watch, then read. Doing it the other way just means I see all the scenes they changed or left out.