7. The Cameos
Samuel L Jackson has admitted that his appearance will be little more than a cameo but he's not the only one to expect. Some suggest that Ant-Man is a certainty to set up his film, there's a pretty virulent strand of theory that says Thanos and Spider-Man will appear briefly, and there have even been rumours that Drax might pop up setting him up as an important player in the Infinity Wars double bill. All of those remains unsubstantiated, but other cameos are more likely. Idris Elba has outed himself and Tom Hiddleston as having a cameo - possibly in the wake of Thor's death. And of course, thanks to Ultron's world tour, Black Panther is a very strong possibility...