In Avengers: Infinity War, we saw how much Thanos struggled and fought to get his hands on them.In Avengers: Endgame, the superheroes went back in time to get their hands on the stones.At the end ...

And, for the record, Iron Man 4 has not been announced or confirmed. Fortunately, Iron Man does make it out of the entire ordeal in one piece. The bad news is that his survival comes at great cost.