Quicksilver returns to the Avengers Mansion, but not to rejoin the team! After an initial miscommunication with Yellowjacket and Wasp, Pietro reveals that his sister, the Scarlet Witch, has been kidnapped after abusing black magic.
1st appearance of Arkon. Jarvis is alerted of an intruder by the Avengers alarm system, however this intruder turns out to be the former Avenger, Quicksilver, who has come seeking the groups aid. When he learns that the group is not there, he speeds over to the docks where the group is seeing Henry Pym and Janet Van Dyne off on a scientific study on the effects on oil fields on wildlife in Alaska.
Quicksilver arrives, and after some initial misunderstanding that leads to Quicksilver fighting the Avengers, he tells them why he has sought them out. He explains that after leaving Magneto, he, his sister the Scarlet Witch and the Toad eventually sought out a means to restore the Witch's lost powers by reading ancient books of magic. While exploring one library of ancient books, they came across one such book. Compelled to incant on particular spell, Wanda transported a being known as Arkon to their world, he quickly decides to choose the Scarlet Witch as his mate. Arkon easily defeats Quicksilver and Toad (striking Toad with one of his thunderbolts, sending him to points unknown.)
After their battle, Arkon explains that he is the ruler of another world which is governed by the glory of combat. It's a world gifted with eternal daylight due to an energy ring that exists around the planet. However, that ring one day dissipated and for the first time, Arkon's world experienced darkness. Seeking the advisement of both scientist and prophet's alike, Arkon learned that it was Earth's scientists experiments with the atom bomb that has caused the destruction of his world's light. With his story finished, Arkon vows to destroy the Earth, however he returns back to his own world taking the Scarlet Witch with him.
Just as Quicksilver finishes his story, the Avengers turn their attention to a TV shop where they see a news report that tells that Arkon has appeared at a conference of the worlds leading nuclear physicists, threatening to destroy the world.