Mlpsgirl
Hermione Granger thought she had her life fully planned out, but all that changes when she's approached by a time lord know only as "The Doctor" and fellow time traveler Marty McFly, to join them in defending the multiverse and to stop a mysterious villain named Lord Vortech from gaining control of their worlds.
(This is basically certain parts from the Defenders series told from Hermione's perspective. The "Prologue" is kinda outdated now, but I decided to leave it.)