If you’re not already backlogged on reading all the sci-fi, fantasy, and horror books that are in line to be adapted (past io9 lists here,
Arnold Schwarzenegger’s 1987 action film The Running Man is based on a 1982 Stephen King story, but only loosely. The names are the same and the idea of a reality show where people are hunted and killed is there, but the film version is widely different beyond that.