Fantastic Four #350 1991.  Doctor Doom has returned and is determined to reclaim his throne from his heir, Kristoff Vernard.
Kristoff believes himself to be the true Doctor Doom, while the real Doom is considered an impostor.  Doom has amassed a massive army of Doombots to attack Castle Doom in a final bid for power.  The Fantastic Four (Mr. Fantastic, Invisible Woman, Thing, and Human Torch) arrive in Latveria.  They encounter an army of Doombots, which they swiftly defeat.
The team discovers four tunnels, realizing that Doom intends for them to split up.
Doom confronts Kristoff and cures him of his mistaken belief that he is the true Doctor Doom.
The real Doom challenges Reed Richards (Mr. Fantastic) to a duel across time.
Thing reverts from his human form back to his rocky, spiky appearance.
Sharon Ventura (formerly known as Ms. Marvel) has been captured by Doom.  Used.

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