Wikipedia
Z'ha'dum
Z'ha'dum is the final episode of the third season of the science fiction television series Babylon 5.
Z'ha'dum (planet)
In the fictional Babylon 5 universe, Z'ha'dum is the homeworld of an ancient, mysterious race known as the Shadows. The planet is near the galactic rim. The Shadows return to the world every time they are defeated, until their final departure from the galaxy in 2261.