In his first appearance, Doctor Doom captures the Invisible Girl, using her as a hostage so the Fantastic Four will travel back in time to steal the enchanted treasure of Blackbeard which will help him to conquer the world and rule it peacefully, but he is fooled by Reed Richards, who swaps the treasure with worthless chains. Doom then forms an alliance with the Sub-Mariner, who places a magnetic device in the Baxter Building. Doom uses this to pull him and the Fantastic Four into space, thinking this will rid him of those capable of preventing him from assuming control of the world's governments; the Sub-Mariner gets to Doom's ship and returns the Baxter Building to New York, stranding Doom on an asteroid. Returning to Earth after learning the secrets of an advanced alien race, the Ovids, Doom exchanges consciousnesses with Mister Fantastic, but accidentally switches the two back again, and Doom ends up trapped in a micro-world somewhere in Sub-Atomica when he is hit with a shrinking ray he had intended to use on the rest of the Fantastic Four. Doom takes over this micro-world, but leaves after the Fantastic Four end his rule. He is then thrown into space when he attempts to send the Fantastic Four there. Doom is saved by Rama-Tut, and he returns to Earth to destroy the Fantastic Four by turning each member against the other using a special berry juice. Richards outwits Doom by using the hallucinogenic juice against him. Doom, believing he has killed Richards in a test of willpower, departs certain of his victory and superior intelligence, although saddened.