Avengers: Infinity War - 12 Behind-The-Scenes Secrets You Need To Know

3. HYDRA Might Still Exist

Though quite a few of the MCU's movies to date have dealt with the destruction of what remains of HYDRA, Ant-Man revealed that there's still an active arm (well, they did always claim that cutting off one part would never deal with all of their branches) of the villainous organisation.

There was also a suggestion in Civil War that Crossbones was still working for them (though he was on a more personal errand in that respect), but other than those hints, we've seen almost nothing of HYDRA since the opening of Avengers: Age Of Ultron.

But, if you look at the cast list for Infinity War, there's a big hint that there's still a pocket of HYDRA working actively, as The Winter Soldier's Jack Rollins (played by Callan Mulvey) is listed as a part of the movie. Could that mean that we'll see the organisation's return - perhaps as the target in Captain America's underground missions at the start of the movie?

Or might those rumours about Red Skull's return have something to them?