Monsters in Greek Mythology
Argus may have had as many as one hundred eyes, which were located all over his body. Hera employed him as a guard. He was killed by Hermes. Afterward, Hera put Argus's eyes in the tail of the peacock, her favorite bird.
Cerberus was a huge and powerful three-headed dog. He was owned by Hades, god of the dead, who used the fearsome hound to guard the entrance to the underworld. In his final labor, Hercules went to the underworld and kidnapped Cerberus.
Each of the Cyclopes was gigantic and had a single eye in the middle of its forehead. The Cyclopes made lightning and thunderbolts for Zeus to use. The brutal Polyphemus, a Cyclops and a son of Poseidon, lived on an island, where he was blinded by Odysseus.
The Gorgons were horrifyingly ugly monsters who lived at the edge of the world. Their hair was made of serpents, and one look from a Gorgon's eyes would turn a man to stone. Perseus killed the Gorgon Medusa by beheading her while looking only at her reflection.
The Hydra was a massive and poisonous serpent with nine heads. Every time one head was injured, another two grew in its place. Hercules sought out the monster in its dark marsh and succeeded in destroying it.
The Minotaur was a man-eating monster with the head of a bull. King Minos kept it hidden in a labyrinth (a maze) in Knossos, on the island of Crete, where he used it to frighten his enemies. Theseus killed the Minotaur.
Scylla and Charybdis
The powerful monsters Scylla and Charybdis lived together in a sea cave. Scylla had many fierce dog heads and ate sailors alive; Charybdis created whirlpools by sucking in and spitting out seawater. Both Jason and Odysseus safely traveled by these monsters.
The Sirens were giant, winged creatures with the heads of women. They lived on rocks on the sea, where their beautiful singing lured sailors to shipwreck. Odysseus filled his sailors' ears with wax so that they might sail safely past the Sirens.