New "Avengers: Doomsday" sneak peek officially reveals Doctor Doom and Loki

Marvel has released a new sneak peek from "Avengers: Doomsday", officially revealing Doctor Doom, Loki and more characters. The film is the fifth mainline Avengers movie and the first in a two-part finale event concluding with "Avengers: Secret Wars". Its release date coincides with "Dune: Part Three", setting up a major box-office showdown reminiscent of Barbenheimer.