After a successful revolution in the country of Latveria, Doctor Doom returned to his kingdom and met a young boy and his mother, still loyal to him. Doom was irate when a robot belonging to Zorba, who was the current ruler of Latveria at this time, slew the woman for breaking curfew. Doom, feeling the woman was under his protection, destroyed the robot and took the boy, Kristoff, to be raised in the royal palace. Soon, Doom decided that the boy would be his heir.
Some time later when the alien Tyros, formerly known as Terrax, was killed due to his own body exploding in a burst of cosmic energy, Doctor Doom was thought to have perished in the explosion as well. It was found out, however, that Doom transferred his consciousness into one of the witnesses present at the event due to the abilities given to him by the alien race, the Ovoids.
Location
This final villain is encountered during Chapter 8.