The Prodigal Three

A five year old Naruto can only look on as the Kyūbi runs rampant and despite the best efforts of Konoha's most powerful Shinobi it looked as if their attempts to remove the threat would end in failure. The appearance of a mysterious child, however, would allow them to seal the creature into Naruto's newborn brother. AU - Minato/ Kushina survive, powerful Naruto, powerful OC