The Guardians have conquered the Nightmare King and sent him back to the shadows from whence he came, but Jack can't help but wonder: What happens next?
Perhaps entirely by accident, or maybe by fate, Jack stumbles upon the very person he thought he'd wiped from existence.
So what will Jack do with this new knowledge, that Pitch Black still exists?
Is the Boogeyman really no longer a threat as he claims, or is it all just a hoax?
And, if it ends up coming to a dynamic decision, who will Jack leave behind:
The Guardians, or Pitch?