8. Vibranium
There have been rumours that Avengers: Age of Ultron will pay a visit to Wakanda, and those reports seemed all the more believable when Chadwick Boseman was cast as Black Panther and added to the cast of Captain America: Civil War. Andy Serkis has also been confirmed as playing Black Panther foe/Ultron ally Ulysses Klaw in this sequel. The evidence is all there then, but the question is - if fans really are going to see Wakanda for the first time here - why? Well, rumour has it that Ultron's big plan is to steal their Vibranium, the rare material which has helped the African nation to become so technologically advanced. It's also the same indestructible alloy Cap's shield was created from. Ultron apparently wants Vibranium in order to evolve into a completely invincible final form, and he will enlist Klaw in order to help him. Fans also believe that they've spotted members of Black Panther's Dora Milaje bodyguards in the most recent trailer for Avengers: Age of Ultron, so what seemed like a silly rumour now appears to be pretty believable.