Return to the Past

AU... YATTF... The Allied Shinobi Forces are on their last legs. The Jūbi has launched a massive Bijūdama at them. The former Hokage are preoccupied to save them, so Kurama and the rest of the Bijū have come up with a last hope. Now Naruto and Sakura must change history to save the world. Strong!Naruto!Sakura! New Senjutsu Style! Minor crossover with Avatar The Last Air bender!