10 Questions We Still Have About Avengers: Infinity War

10. Where Is The Soul Stone?

Just one of the Infinity Stones remains unaccounted for in the Marvel Cinematic Universe, and that's the Soul Stone.

The Space Stone is locked up tight in Odin's vault, the Mind Stone is embedded in Vision's forehead and the Collector has the Reality Stone.

Meanwhile, the Nova Corps are looking after the Power Stone - which won't fill anyone with confidence - and the Time Stone is Doctor Strange's Eye of Agamotto amulet. So, where in the known universe is the elusive orange gem?

There are precious few Marvel films left for it to show up in, just Thor: Ragnarok and Black Panther. It's feasible that it could be in Asgard or Wakanda, more likely the latter as the Norse realm already plays host to one gem.

A number of fans have also asked whether the stone has been right under the audience's nose the whole time, in the possession of Thor's ally Heimdall, pointing to his fiery orange eyes and ability to see see "10 trillion souls" from his post in Asgard as evidence... but, again, surely they wouldn't keep two gems so close together?