50 years into the future, time has not been kind to Jack. Aku has destroyed all of the time portals, thwarting the journey to travel back in time and stop him. Now, Jack is immortal (as a side effect of the time travel), but broken and lost. Aku, similarly, has everything he could ever want and is equally miserable. It’s a dark vision, not just in terms of the world, but in the personal despair.