Mambo the Fifth

King Mambo the Fifth was the leader of the Pyro Vipers in ancient times. He and the First Spinjitzu Master agreed upon peace between humans and snakes, under the terms that neither of the two beings crossover into each other's land. A young sorceress named Aspheera used the power of Spinjitzu to overthrow him, but she was defeated by Wu and Garmadon, restoring him to power. He sentenced Aspheera to magical entombment.

Season 11: Secrets of the Forbidden Spinjitzu

 * 109. "Never Trust a Human" (Flashback)

Trivia

 * His name may be a reference to the song, 'Mambo No. 5'.
 * It could also be a pun on the Black Mamba, a venomous snake native to Africa.