Avengers: Infinity War looks as if it's going to be one of the biggest narrative plate-spinning exercises in blockbuster history. Intended to tie together the entirety of the cinematic side of the MCU (though it'll no doubt impact upon the TV shows, too), the film will have to juggle the conclusions of the various Avengers' plotlines, but also squeeze in an appearance from every member of the Guardians of the Galaxy, not to mention properly introducing Josh Brolin's villainous Thanos after so much build-up.