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>Jack realizes that the answer is not in travelling back to the past, and comes to terms with the fact that his kingdom's and family's time is over
>ultimately decides to fight for the future of the world and those in it.
>manages to defeat Aku with the assistance of the countless friends he has helped throughout his journey
>helps to rebuild the shattered world and perhaps establish a new kingdom
Genuinely the best, most poetic ending for such a noble, self-sacrificing character.