Secret Wars #8

While the battle in Doomstadt waged on, the two Reed Richards were transported by Star-Lord to Castle Doom. The Thing from the Shield joined the brawl, and easily destroyed anything in his way. Franklin von Doom opposed him using his Galactus, and The Thing decided to surrender after learning the kid he was fighting was the son of Sue Storm. When God Emperor Doom joined the battle against the recently-arrived Annihilation Wave, Valeria convinced her mother to run away in order to show her something.

As the two Reeds looked for Doom's power source, Star-Lord remained behind repairing their ship, and he was confronted by Black Swan. The ensuing fight, during which Quill is easily overpowered, took the two of them to Doom's throne room, below Yggdrasill. Star-Lord used a splint of Groot on the magical tree, which engulfed it entirely, and turned Yggdrasill into a giant Groot that destroyed the castle from the inside out. Valeria and Sue witnessed the fall of their home from the castle garden, and they encounter the two Reeds trying to access to the Molecule Man's chamber.

Back in the battlefield, Thanos unsuccessfully confronted Doom, and was easily killed. In the moment right after that, the Siege Courageous opened up and a horde of zombies came out. After the zombies, Namor and Black Panther, who had the Infinity Gauntlet, came out proclaiming this to be the end of Doom's reign.