The Untold Story of the Tubbies [AU]

In a world where humans have doomed themselves due to nuclear warfare, a new humanoid species is created to fill the void. But in the beginning, there came the trials where the scientist creators examined their behaviors and what they could fix in the next generation.

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Tinky Winky is the oldest of him and his siblings in the home and land they've known as long as they can remember. Everything is good and well in teletubby land, until something strange is noticed about his oldest younger sister, which is soon followed up by things like them appearing in their home that are furless, monstrous, and bloodthirsty.

What's more is that they're soon approached by an older tubbie like them with white fur who admits he's been watching over them all their entire life. He plans to contact the military, but they soon have to split up as the things soon overrun the area. They venture across the land, coming across various findings, some pleasant, some dangerous, and some that ensure Tinky Winky and his siblings wouldn't ever quite be themselves again.

However, even after rescue and meeting new and old faces, everyone finds out there's far more to the rabbit hole they've found themselves in that first suspected. Can Tinky Winky and the other teletubbies discover the truth and more before it's too late?

Inspired and loosely based off of Zeoworks' Slendytubbies series as well as Growing Tension by Xtreme.
(Warning for some levels of gore and brutality + Much of the stuff in the story is not my own, please don't sue me because I'm a good (REDACTED) that doesn't intentionally plagiarize)