Scylla is a sea monster from ancient Greek mythology, often depicted as a creature with multiple dog-like heads and a serpent-like body. She is famously known for her role in Homer's epic poem, the Odyssey, where she resides in a narrow strait opposite another monster, Charybdis. Sailors who attempt to pass through this strait face the peril of being devoured by Scylla. In the myth, Scylla was once a beautiful nymph who was transformed into a monster by the sorceress Circe out of jealousy. This transformation led her to terrorize sailors, making her a symbol of danger in the sea. Scylla's story highlights themes of transformation and the consequences of envy in mythology.