Take a look at the latest Marvel Studios trailer of the upcoming Avengers: Infinity War film.
This movie has basically every superhero thus far introduced into the Marvel Cinematic Universe, and will feature the first meeting of the Guardians of the Galaxy with the Earth-based Avengers and other superheroes. As fans know, Thanos (the bad guy), has been behind all sorts of nefarious plots leading back to Loki’s attempt to take over Earth with the Chitauri invasion back in the first Avengers movie. Out on the cosmic side of the Marvel Cinematic Universe, the Guardians of the Galaxy have been dealing with Thanos and his lackeys (Ronin the Accuser and Nebula) for a while now.
Clearly, Thanos is the big connector for all the moving parts in the Marvel Cinematic Universe, and, based on this trailer, it should be one heck of a ride. By the way, notice that we have an end-credits-type scene at the conclusion of the trailer?