With Iron Man 3 in post-production and hitting our cinemas on May 3rd of this year, I've been thinking about who from the Marvel Universe it would be good to see in the inevitable after-the-credits scene that we've become so accustomed to in these movies. Up to now we have seen post-credits scenes including Tony Stark himself, Nick Fury, Loki and Thanos, amongst others, and they have served as huge talking points for movie audiences around the world, teasing what is to come in future instalments to the Marvel Cinematic Universe. Done right, they can seamlessly induct new characters and storylines in to the Marvel Cinematic Universe and the potential for cameos in Iron Man 3 is huge. Here, I take a look at a few of the possibilities that we'd like to see.