With the world teetering on the edge of the Eschaton, the Avatar Spirit has reincarnated into the last person imaginable: Princess Azula of the Fire Nation. With the return of Sozin's Comet fast approaching and the thread of prophecy severed, the proud child of the Fire Nation may be last hope of a world doomed by her Great-Grandfather's ambitions.

AU. The Cold War ended for everyone except Natasha. With nothing left except revenge after a lifetime spent fighting. What better way to end but show down between her and another child of the supersoldier serum? But Cap has supposedly been dead for decades. She'll have to find him before she can live up to the moniker of Black Widow. No plan survives first contact with the enemy.