He-Man and the Masters of the Universe: Season 2, Episode 8
The Masters of the Universe learn from Lord Dactys that King Hssss and his Snake Men are alive and well and are attempting to retrieve the powerful Serpent's Ring from the Sea of Rakash. Immediately, the Masters set off in pursuit, catching up with King Hssss and his henchment at the village of Felis Folia. With the Serpent's Ring now in his possession, King Hssss has already transformed the villagers into Snake Men, and does the same to the Masters when they arrive. It is up to He-Man, Roboto, and Orko to stop King Hsss form turning everyone on the planet into snakes!