A planet in the Babylon 5 universe. It is the homeworld of the Shadows, and was also home to Lorien, the first of the First Ones from time immemorable. Other alien races also inhabited Z'ha'dum, among them the Drakh, although it is unknown where their homeworlds lie.
The planet was destroyed shortly after the end of the Shadow War, when Sheridan and Lyta returned to look for abandoned technology, accidentally (purposefully, on Lyta's part) setting off a self destruct system