In search for a replacement for his pet Daisy (his rabbit). Doomguy finds himself in Equestria right after Twilight enchanted Smarty Pants with the Want it Need it spell.
In the near future mankind was driven into a biochemical war against an unidentifiable contagion created by an asteroid that struck the planet. Without no cure or any form of escape, mankind buried themselves and awaited their extinction.
Lee Harrison was forcefully ripped out of his life as a father and placed into a new life as a butler, working for a ruler of a species he's never seen before.