Charybdis & Scylla was a monster duo from the epic play by Homer, The Odyssey. 

Scylla was a supernatural female creature, with 12 feet and six heads on long snaky necks, each head having a triple row of sharklike teeth, while her loins were girdled by the heads of baying dogs. From her lair in a cave she devoured whatever ventured within reach

Charybdis, who lurked under a fig tree a bowshot away on the opposite shore, drank down and belched forth the waters thrice a day and was fatal to ships in the narrow straight. She was often depicted as a whirlpool.
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