During the course of Fantastic Four Victor von Doom slowly mutates into some kind of metallic creature being able to shoot lightnings (and thus becomes Dr. Doom), a transformation that is completed at the end of the movie, when he seems to be completely made out of metal.
And yet in the sequel Fantastic Four: Rise of the Silver Surfer he suddenly is back the old human Victor (while still being able to shoot lightnings) and his metal outfit is just a suit/mask. So how come this change? Is he now able to control his mutation, did I overlook something in the story (or maybe not in the movies but the comics, which I'm completely ignorant of), or is this just an inconsistency (and which version is then more true to the comics)?