Accidental Time Travel

BEING REWRITTEN AS DEATHLY TIME TWISTS! WILL BE DELETED SOON! AU Sixth Year. A potion mistake causes several people to go back in time. They struggle to escape and return to their own era, however, soon it is discovered that they have a mission to accomplish: Defeating Voldemort and saving all those who died. Warning: OCs. Don't like, don't read. Rated T just in case.