Top Definition
The primary villain from the popular 1980's animated series ThunderCats. His appearance is usually that of a mummy with a red cowl but he can transform into a more powerful form by reciting the words "Ancient spirits of evil, transform this decayed form to Mumm-Ra, the Ever-Living!"
The evil Mumm-Ra has been plotting to rule over all of Third Earth!
by Strideo June 22, 2007

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