There are many Marvel fans who have forgotten that, before becoming Captain America, Anthony Mackie once took on a very different kind of battle on screen – against Eminem in the Oscar-winning drama 8 Mile. Taking part in a rap battle with one of the greatest rap-stars of all-time can be a daunting task, but what made the scene ever more notable was that Eminem ensured that it included a very calculated and personal “attack” on Mackie himself.