User blog comment:JoePlay/The Avengers Battle Royale - The Free For All: Part 1/@comment-61668-20120408214422/@comment-5001797-20120409033915

Thor and Mr Immortal are different types of Immortal. Mr Immortal can die, and bring himself back to life again. Thor is a god. When Mr Immortal dies, he comes back. When Thor, in the unlikley event that he dies, is dead. I'm sure that, even if it takes years to do so, Mr Immortal could wear Thor down. That is, unless Thor can do some Asgardian curse/incantation to strip Mr Immortal of his powers.