"Sir, does this mean that Ann Margret's not coming?"
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"One of the maddening but beautiful things about comics is that you have to give characters a sense of change without changing them so much that they violate the essence of who they are." ~ Ann Nocenti, Chris Claremont's X-Men.
Even if OMT doesn't work, Doom has multiple option including Power Jacking DD. And to answer the question, Doom once took the Beyonders powers. Pre Retcon.
But he did it! You don't think he could power jack DD? If he can do it to Surfer, Doomdays should be childs play.
He doesn’t have prep time in the Arena. Or equipment.