Astrorubies are precious stones found in asteroids. They can easily be confused with Fool's Rubies. The only appearance they made is in A Beautiful Mine. They were also mentioned in The Incredible Shrinking Town and The League of Villains.


According to Zix, the immense value of astrorubies causes those in possession of them to go mad with Ruby Madness. Throughout the episode, Jimmy and his friends, even Goddard, begin to fight over the astrorubies, prompting Carl to scream "Ruby Madness!" at every instance. Eventually, Jimmy used up all of the astrorubies in order to create fuel to get the disappointed crew back to Earth.

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