10 Worst Book-to-TV Adaptations, Ranked
The absolute worst TV shows based on books disappointed readers and viewers, with terrible adaptations including Supergirl, The Rook, and Caillou.

It's nothing new or revolutionary for TV shows to base themselves on books, especially in this modern age of streaming. Heck, some of the most successful shows of all time, like Game of Thrones, are based on books. Since most of these shows have source material to fall back on, it's easy to create something that is enjoyable and that keeps people coming back for more. Unfortunately, it's even easier to muck everything up.