This one really needs no introduction:
Judging from the trailer, Iron Man 2's storyline seems to be modelled thematically after Rocky III (my personal favorite of the series) -- Tony Stark becomes Champion of the World, basks in the public's adulation, then gets a little too comfortable, a little too cocky, and is brought down by a tougher, hungrier adversary. In this case, Rourke plays the part of Clubber Lang, with Cheadle as Apollo Creed and Gwyneth Paltrow as Adrian.
Judge for yourself:
Methinks Sylvester Stallone might be entitled to a screenwriting credit.
Iron Man 2 opens May 7, 2010.