Fallout Transformers

"Well, Earth was fucked."

Fallout is a Transformers fanfic by Nan00k. It follow a group of Autobots, Decepticons and humans in an AU universe after the '07 movie. Basically, Megatron has turned into Galvatron and he and his drones have taken over Earth, which, as the page quote says, has gotten pretty messed up...

Two sequels can be found here and here.

Not to be confused with the video game of the same name.