Generations ago, a Vault 47 resident by the name of Dr. Kevin Rossman left his underground home and went on your typical Vault Dweller adventures, being the protagonist of his own little Fallout story that all happens off screen. He finds his way to Vault 18 in the Black Bear Mountains.
There, he formed a group called the Wasteland Scouts, who got into all kinds of hyjinks and managed in their time to piss off every single major faction in the wasteland, including the NCR and every single raider gang from here to the Frontier (yes, they actually foreshadow that place in this mod).
A couple of generations ago, the vault was becoming overpopulated, and the exploits of the Wasteland Scouts gave many couped-up residents (specifically, the entire upcoming youthful generation) the idea of leaving to find a new home in the outside world. So after getting a list of potential settlement sites from the Scouts, they let an entire generation walk off into the Wasteland.
Those settlements mysteriously disappeared without explanation, with the only clue as to what might have transpired being a bunch of babies left in the burning ruins. And trust me, once you learn why, you’re going to wish the babies had been left to die there…
Before the Great War, a Senator named Andrew Oran convinced his fellows in the Enclave that the Vaults might need a “Plan B.” This plan was seven super top secret experiments, codnamed: Project America, Project Brazil, Project China, Chrysalis, Project Denmark, Project England, and Project France.
Project Brazil is the important one, specifically it was an experiment to make people immortal and invincible through rapid cell replication and regeneration. The breakthrough came from an alien worm from Area 51, an organism that was capable of reproducing itself, as well as copying the DNA of whatever host it infects and keeping the host’s body safe from infection and radiation damage.
Just before the Great War, Senator Oran decided that the ideal canditate to test this alien worm was his own daughter, Annai. Being infected with the worm gave her powers such as self-replication, immense power, as well as immunity to disease and radiation. After the bombs fell, she was taken to a secret Enclave base and cloned. One clone would adopt her identity, the other would become a man for some reason and take the name John Bragg. Eventually, the original Annai would break under Enclave indoctrination and torture, assuming the name Chevy Bragg and becoming her “brother”s subordinate.
But it wasn’t just the Enclave interested in the space worms. One of the leader researchers of Project Brazil would become a super mutant, who by the time the game starts is referred to as The Father. Originally, his name was Mark and he was supposed to be part of the team Richard Grey and Harold lead into Mariposa before the events of Fallout 1. Suffice to say, they contradicted canon by saying he fell into the vats and surviving by becoming a mutant (even though that expedition canonically had no survivors save for Harold and Richard themselves).
After the death of the Master in Fallout 1, and the destruction of the FEV tanks in the Mariposa Military base, things where looking grim for the Super Mutant Army. Without leadership they all scattered and went their own ways. But Mark had ambitions of reviving the plan, and intended to use his old project to do it. So after finding a fresh supply of prime normals (donated so generously by Vault 18) he abducted them and had the women impregnated with special embryos.
Those embryos where made from genetic material gathered from the Vault Dweller (the player character of Fallout 1), effectively making them clone-babies of him each one was then implanted with the Project Brazil worms. The babies where then discovered by the Wasteland Scouts and brought back to Vault 18, adopted by the now agining generation as their own children.
During this expedition, of which the original purpose was to-no I am not kidding-find a replacement for a broken water chip…yes you may all groan now, if you haven’t already-they encountered the Bragg “twins”, who posed as destitute but helpful wastelanders, who knew juuuuuuuuust where to find a replacement. For their service, they where let into Vault 18 and allowed to hold positions of significant influence. Chevy Bragg became head of Vault Security, while John Bragg became the coach of the Vault Ball sports team: The Vault 18 Patriots. Due to his position, he would have a great deal of sway over the newly adopted children of the vault.
You are one of these children. Eighteen years after all that, you’re involved in a Vault Ball game and the mod begins.