The Snake Men are a fictional race of evil humanoid snakes in Mattel's Masters of the Universe franchise.
Released later in the original franchise's run, there was considerable retconning to work the Snake Men into the existing Masters of the Universe mythos.
In the distant past the Snake Men were a vast, ruthless army that conquered numerous worlds, and served an evil ruler named King Hiss. Hiss and the Snake Men tried to conquer Eternia, and created Snake Mountain as their base of operations. However, the Elders of Eternia proved too powerful for the Snake Men and used their magic to cast Hiss and his army into a limbo-like dimension. This caused the empire of the Snake Men to collapse, although a small number of them remained on Eternia. Eventually, Hiss is set free by Skeletor, who had made Snake Mountain his base.
Hiss and Skeletor form an uneasy alliance against He-Man, the greatest opposition to their mutual dreams of conquest. Skeletor's Snake Man minion, Kobra Khan, serves as his ambassador to King Hiss. Together the two villains are able to trap He-Man. They attempt to use their combined magic to pull the entire Snake Man army back into Eternia, but even their combined magical abilities united are only strong enough to return two snake soldiers: Tung Lashor and Rattlor. Realizing that they need more potent magic to resurrect the entire army, Hiss and Skeletor take He-Man's Power Sword, and attempt to use it to summon forth all the Snake Men. However, He-Man is able to free himself and recover his sword, foiling the return of the reptilian hordes.
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