Next time we see them, the Invisible Man is threatening Marvel. Apparently, Marvel tried to run away (though he claims he didn't). That would not have been cool, since Marvel is carrying all of the Invisible Man's stuff, including his research notes.
The Invisible Man is also upset that the news of all this hub-bub will be in the paper. It's too bad he didn't think of that when he was beating the heck out of people.
Even though Marvel points out that he's a bad sidekick, the Invisible Man won't let him leave.