KrytenKoro - "It's always best when the other chap is willing to die for his beliefs; you both have the same goal in mind." TALK -
Now that we can get a clearer look from the ultimania, it's clear that the Iron Prisoners are the same thing. First it breaks free of its chains, then the iron maiden-thing it's in, then it gets an armor and hammer powerup. Do we want to merge?
Yes, the Iron Prisoner articles are far to small to be separate articles.