Frank Herbert’s *Dune *books are dense, and so is the teaser trailer for *Dune: Part Three*. Set to another dramatic score by Hans Zimmer, the first look at the conclusion to director Denis Villeneuve’s trilogy is packed with new characters and plot details that make a lot more sense if you’ve read *Dune Messiah***(and the other sequels to Dune). If not, you may be feeling pretty confused. Allow us to help. Here’s a breakdown of who’s who and what’s going on in the *Dune: Part Three *trailer.