Starlight's Multiverse

Starlight Glimmer went back in time and created seven timelines alternate to the one we know and love. It's been so long, and finally, the Cutie Map calls the ponies destined to jump timelines and stop the Crystal War, end the Changeling Invasion, bring back the sun, and defeat other villains to bring peace back to the seven desolate worlds that were left on their own. It will be a very hard job, but who can do it if not the chosen ones? Follow their adventure in Starlight's Multiverse.

Excerpt:

Suddenly, a small sneeze came from under Sweet Victory's seat, and he immediately clasped his mouth shut. The little filly, Poppy, poked her small, red-maned head out from under it. "I don't know who you are, but thank you. I heard you. I don't know who you are or why you're here, but it sounds like you want to help the princess and you really believe in yourself, so I will do to."
She clumsily got out from under Sweet's seat and trotted off to her family on the opposite side of the train car. Then I'll do it, Doctor Whooves thought. For you, little one.

I'm not marking this story mature, because there's no inappropriate content, but so far, there's implied massacre by missles, and there will be other things, such as implied burning alive, if things like that bother you, YOU HAVE BEEN WARNED.