Now, we know what youre thinking. Tony Stark? In Guardians Of The Galaxy?! The worlds just not that good to us. And youd probably be right. As far as we know, Robert Downey Jnr. is contracted for the next Avengers movie, and the one after that and thats it. But RDJ doesnt have to be on screen here. After all, Iron Man is a CGI creation, and a blink-and-youll-miss-him appearance wouldnt even need him to remove his helmet. Technically, Iron Man has been a member of the Guardians, so its not such a stretch that they might choose to have him appear, if only briefly. One way of doing it could be to have a small flashback see Star-Lords ship nearly hit old Shellhead as he fell down towards the wormhole in space after nuking the Chitauris fleet at the end of The Avengers. Another possibility could see one of Stark's armoured suits being adversely affected by the events of the Guardians Of The Galaxy movie (of which, more later). However they might do it, its one of the few shout-outs that would have the whole audience cheering, not just the few dozen comics fans in attendance. It's also possible that it might heavily disappoint people if Iron Man was teased but Tony Stark never made an appearance, though... hence his low showing on this list.