Avengers: Infinity War - 15 Things Marvel Want You To Forget First

14. That Tony Stark Has Extremis

When It Mattered

At the end of Iron Man 3, Tony Stark managed to somehow reverse the Extremis "infection" that Aldrich Killian had given Pepper Potts and isolated the virus and stopping her from exploding. Rather ungratefully, this is apparently when she suggested they should probably see other people. Harsh.

Thanks to Agents Of S.H.I.E.L.D. we know that the virus was later used and was stabilized thanks to the Centipede programme. And there's no way Tony Stark didn't keep ahold of some of it himself, thanks to his inquisitive scientist's brain.

But Now...

Extremis has vanished entirely from the MCU, despite the fact that a weaponised version that could literally make infected enemies EXPLODE would be really, really useful against an enemy as terrifying as Thanos and the Black Order. If you could literally turn them into bombs and have done with it - with the fate of half of existence in the balance - there's no way you wouldn't.

And even in stabilised form, using it to help allies who might be gravely injured or might require a superheroic boost would be just as useful. But there's no way it'll even be mentioned.