Mumm-Ra is a being of almost pure evil.  Known to be at least over 1,000 years old, he is in the eternal service of the ANCIENT SPIRITS OF EVIL. They give him the power to do anything.  Mumm-Ra has fought both Good forces (Wizz-Ra, Mumm-Rana) and Evil (Zaxx, The Lunatics) to contain control of Third Earth.  After the Thundercats crashed on Third Earth, the mutants were wondering around and came upon his pyramid.  He shot there space ship down and formed an alliance with them.  Here tried many plots over the years.  Then he discovered three Thunderians on Third Earth.  Lion-O rescued them, but then Mumm-Ra grabbed the Star of Thundera and opened it.  He was almost completely destroyed, and left in a very weak state.  Mumm-Mut rescued him, and descised as Mumm-Ra, told the Mutants to free the Lunatics.  Even with them free, he couldn't stop the Thundercats, so he made Thundera reform into New Thundera and gained the Sword of Plundar.  Still, he couldn't stop them. And the Ancient Spirits of Evil weren't happy about it.  After enough defeats, the Spirits told Mumm-Ra he had one more day to defeat the Thundercats or be banished.  He failed and was banished.  And the Thundercats moved the New Thundera.

    Then, the Ancient Spirits of Evil Freed Mumm-Ra and sent him to New Thundera to destroy the Thundercats.  He final got the Book of Omens, and almost froze the Thundercats in time, but Lion-O defeated him.

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