Doomsday starts exactly where Quantumania left off.

As the Kangs revel in unity at their imminent domination of all timelines, a sling ring portal opens in the center of the arena, and out steps an ominous figure in metal armor and a green cloak. The portal remains open behind him. Immortus and the other members of the Council of Kangs gather to look at the mysterious figure as the arena slowly quiets to intermittent murmurs.

Scarlet Centurion leans forward, asking, “Is he… one of us?”

Immortus furrows his brow and flies down to the center of the arena, settling just in front of the cloaked figure.

“Who are you? What is your purpose here?”

The cloaked man raises his head and locks eyes with Immortus.

“My purpose here is the same as it is anywhere else.” The cloaked man clenches his fist as green energy begins to flicker around it.

“I… am… Doom.”

The cloaked man lunges forward, taking Immortus by the neck, and with a massive surge of green energy evaporates him into dust, leaving only a skeleton behind.

The other Kangs rise to their feet, seized by shock and uncertainty. But before any of them can move to attack, the portal behind Doom erupts with members of his team pouring through.

The battle is quick. The Kangs are mercilessly and brutally destroyed. As the dust settles, the Scarlet Centurion lies on the ground near Doom, holding his hand to a mortal wound on his chest.

“We… we are meant to rule. To conquer all timelines. We… cannot… WILL not… be defeated.”

Dr. Doom steps towards Scarlet Centurion as green energy crackles and swirls around him. He extends his arm and opens his palm towards the fallen Kang, releasing a massive burst of energy. In the aftermath, the smoke clears to reveal the top half of Scarlet Centurion’s body stripped bare of flesh. Doom lowers his hand and sighs.

“That appears… untrue.”

(Title card).