In the dawn age of Equestria, Clover the Clever and Smart Cookie march forth to fight a dragon. Princess Platinum's helping too, though. Whether they want her to or not.
Saitama wakes up bored one day, only to find a portal in his room. Being Saitama, he walks straight through it. In the new world, he meets a young filly name Lily Longsocks who is as strong as he is. Of course they get into a fight.