10. Justin Hammer

Justin Hammer was, of course, the brilliant secondary villain in the otherwise quite underwhelming Iron Man 2.

Played by the wonderful Sam Rockwell, he was a military contractor and the C.E.O. of Hammer Industries who – in his mind at least – had a rivalry with Tony Stark when it came to weapons manufacturing (even though he also quite clearly wanted to be Stark’s pal).

He provided Ivan Vanko with the materials to build some Iron Man-esque powered armour, which he would then sell to the military – although, as we all now know, Vanko had his own ideas on that front.

He’s currently in custody in Seagate Penitentiary, but that rarely stops villains in the Marvel universe, and he’ll see Stark’s death as an opportunity to both get one over on the heroic Avenger posthumously and become the most famous manufacturer of weapons in the world.

With that in mind, we think he’d jump at the chance to join a new evil faction, if he was approached in jail and subsequently broken out. He could be the team’s weapon supplier, ensuring they had lots of destructive power at their disposal.