The final trailer for "Dune: Part Three" is out, teasing big battles and danger at every turn. Set 19 years after the previous film, Timothée Chalamet's Paul Atreides faces an assassination plot involving Zendaya's Chani. “I’ve become the oppressor Chani swore to fight,” Paul admits, while Chani later calls him a traitor. The trailer also introduces Robert Pattinson as the scheming Scytale and hints at the return of Jason Momoa's Duncan Idaho. "Dune: Part Three" hits theaters December 18th.