Six degrees of Douglas

It’s common knowledge that 90 per cent of sequels to anything—be it a film, a book, or an article in your school’s paper—are just not quite as good as the originals that spawned them. Sometimes, the sequel in question is acceptable, if still inferior to a noticeable degree; just as often (okay, slightly more often), you encounter a sequel that is so horrific that you envy those existing in another version of reality where it stayed in the depths of hell where it belongs forever (or, at the very least, you try to get a refund).