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In page Doctor Doom:

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When Franklin Richards was kidnapped by Onslaught, Doctor Doom joined forces with the Fantastic Four, Avengers and the X-Men to battle him in Central Park.[citation needed] During the fight, Doom was forced to sacrifice himself alongside others to contain Onslaught, which allowed the X-Men to destroy him.[citation needed] Though believed dead, Doom and the heroes were saved by Franklin, who created a pocket dimension called Counter-Earth, where Doom later uncovered a secret power linked to Franklin and persuaded the boy to relinquish control of the world.[citation needed]