The Black Nightmare is a Jackie Chan Adventures fic set after the end of the canon series.
- Be Careful What You Wish For: Hsi Wu manages to escape from Jade and get the solitude in his fortress that he had always wanted... but can't enjoy it because he keeps thinking of how he abandoned Jade and the others.
- Big Bad: A repowered Daolon Wong is the main antagonist.
- Conscience Makes You Go Back: After escaping Jade and fleeing with his Citadel, Hsi Wu's guilt over abandoning Jade drives him back.
- Continuity Nod: Hsi-Wu portal episode is brought up more than a few times.
- Darker and Edgier: Since Wong kidnaps Jade at the start of the fic, it's safe to say it's darker that JCA canon.
- Hazy Feel Turn: Hsi-Wu is bound to Jade, and technically on the side of the good guys, but he seems to have his own plans.