Synopsis
We break off the current Avengers storyline for another Avengers 1,000,000 BC origin, this time of the 1st Iron Fist.
15-year old Fan Fei was born in the mystical city of K'un-Lun which even then only appeared on Earth in the Himalayas every 10 years. Like every child of that city she learned martial arts, and in the 3 months of this visit she has been out in the world teaching Kung Fu to cavemen. This went against the most sacred rule to keep their secrets secret, so the Thunderer now sentences her to death in the cave of the dragon Shou-Lao.
But 1st her pupils are thrown in to be burnt and clawed by the dragon. The enraged girl snaps the chain around her wrists, defeats her guards and leaps into the cave after them, but they are already dead. She faces Shou-Lao and leaps with a double-fisted strike into its mouth and out the back of its head. The dragon dies and the dragon symbol is burned into her hands.
Now for *that* crime she is exiled to Earth before the city vanishes again. There she learns to use her martial skills and her Iron Fists to defend herself against predators. In the following years she travels the world. She visits a hidden valley of surviving dinosaurs (the Savage Land). She meets the Deviants in their underground cities and they learn to hate her.
Fan Fei no longer teaches her skills to the cave people, but she does protect them from danger and in return they worship her as a goddess. 1 of their enemies was the Gorgilla man-apes of the Great Dead Forest.
1 night as Iron Fist sits by her lonely fire she is visited by Mephisto in the form of a serpent emerging from the flames, who mentions that even the Mother Of The Undead fears her power. He 'commends' her for protecting the weak cavemen, but tempts her by suggesting that the only way to *really* save them is to force them to become strong. And the only way to do that is by ruling them (with an iron fist). She rejects him and abandons the use of fire.
However Mephisto teaches the Gorgillas to use fire, and this intensifies their danger. And their alpha-male leader, who may be named Gorgunga, now has a very large diamond club. Which Fan Fei shatters with her Iron Fist. So Mephisto ups the ante by leading the ape king to the Power Stone of the Infinity Stones. He is now transformed so that his right arm is diamond with the Power Stone embedded in the fist. Even the Iron Fist can't break this and so she gets beaten up.
10 years are up and K'un Lun reappears, and the Thunderer welcomes Fan Fei back. The dragon died but was reborn as Shou-Lao The Undying and the ruling Dragon Kings now realise that the Iron Fist power is a gift from him. Fan Fei can take her place as the greatest defender of the city.
But the young woman declines this offer too. She will stay on Earth as defender of the cave people. And we see an image of the rest of the Avengers 1,000,000 BC that she will join.