Everyone here is dissing on you but I think it could work, you just need to refine it a little. The world starts off in the TES universe, and thusly the creation of that universe is the start for all of them. Time progresses from TES Arena to Skyrim and a little beyond. Then it happens An event so catastrophic it tears the world apart, churning and distorting the continents and destroying one of the moons. Magic and all knowledge related to it is lost, and the Aedra and Daedra and locked out of this world. Any mortals trapped in Oblivion or elsewhere are permanently so stuck, while the gods and Daedra are left to mutate in their dimensions. However out of all this, life survives. The mer were wiped out, along with all the beast races and magically adept humans (aka Bretons). Some plants survived (nirnroot for example) and most non magical animals did too. When the dust is finally settled, we are left with the Earth and humanity as we know it. Progression: from the Mongol Empire to the Russian Revolution. Then history starts to divert towards the Fallout universe. Now here's where the theory gets a little sticky, as there could be two options: A) The UAC becomes a private enterprise and successfully makes it to Mars and colonizes with little to no tech or info being revealed. B) After society has been rebuilt, presumably with the help of Vault-Tech, UAC forms and launches into space to colonize Mars Either way, they wind up on the Red Planet, open up the gates to what is actually a realm of Oblivion, and Doom begins from there. There! Little to no flaws (I think) that would bring it down entirely. I just didn't want to see you get completely shit on by everyone else on the forums. At the end of the day they are just Easter eggs, but hey, it's just a theory, a Game Theo-*sued for plagiarism*