|"Analysis Conclusive! Asteroid composed entirely of unique anti-ghost element, Ecto-ranium! The effects of which can only be felt by ghosts."|
|— Maddie hologram to Vlad Plasmius.|
Ecto-ranium is a mineral from outer space. It causes great pain to any ghost or half-ghost who touches it and prevents them from using their ghost powers. The Disasteroid is entirely composed of ecto-ranium, and thus posed an extreme threat to both Earth and the Ghost Zone.
- Main article: Disasteroid
Ecto-ranium only appears in "Phantom Planet" as the material that the Disasteroid is made of.
Though never used as such in the show, ecto-ranium is mentioned to be a powerful weapon against ghosts.
Ecto-ranium is likely based on kryptonite, the only weakness of the comic book superhero Superman. They are both depicted as glowing green rocks from outer space and both can completely negate their series' protagonists' superpowers.
- 312. "Phantom Planet"