| A | B |
|---|
| ARGUS | The many-eyed hunter who stalked Io until Hermes lulled him to sleep and killed him |
| CERBERUS | Hades's 3-headed watchdog who guarded the shores of the Styx |
| CHARON | The boatman who transported souls across the Styx (for a small fee) |
| CHARYBDIS | The massive, bottom-dwelling sea monster that engulfed huge amounts of water and spat it out again |
| CHIMAERA | A fire-breathing monster with the heads of a lion and a goat and the tail of a serpent — killed by Bellerophon |
| CYCLOPS (POLYPHEMUS) | A huge ogre with one eye — fond of gobbling up Odysseus's men |
| ECHIDNA | A female monster with the lower body of a great serpent — the mother of many monsters |
| GERYON | The three-bodied, three-headed ogre who dies trying to fend Hercules off his cattle |
| GRYPHON / GRIFFIN | A treasure-guarding beast with the head and wings of an eagle and the body of a lion |
| HARPY | A vicious, foul-mouthed female monster with the lower body and wings of a bird — gobbled up and fouled old Phineus's meals |
| HECATONCHEIRES (BRIAREUS) | The 100-armed, 50-headed giants who helped Jupiter overthrow the Titans |
| HYDRA | A 9-headed dragon whose heads, if decapitated, would grow back in greater numbers |
| DRAGON (LADON) | The ferocious, serpentine beast that guarded the sacred golden apples of the Hesperides |
| LAMIA | A vicious, half-woman, half-serpent monster who stole children and drank their blood |
| GORGON (MEDUSA) | One of three terrifying women with serpentine bodies, snaky hair, and a gaze that turned people to stone |
| MINOTAUR | A massive, bull-headed man who stalked the Labyrinth in search of human sacrifices |
| CENTAUR (NESSUS) | A half-man, half-horse beast who lusted after women and even tried to kidnap Hercules's wife |
| PEGASUS | The winged horse that arose from Medusa's blood and helped Bellerophon defeat the Chimaera |
| PHOENIX | A fire-colored bird that lived 500 years and then burst into flames, only to rise from its own ashes ... reborn |
| SATYR | A half-man, half-goat beast who frolicked through the wilderness with an assortment of nymphs |
| SCYLLA | A horrific beast (part-woman and part-serpent with dogs' heads around its waist) that lunged from its cave to devour passing sailors |
| SIREN | A lovely-voiced creature (part-woman + part-bird) whose song lured sailors to their deaths upon the rocks |
| SPHINX | A mysterious, riddle-loving creature with a woman's head, a lion's body, and wings |
| TYPHON | Gaea's last + most dreaded offspring, a terrifying monster who hurled mountains at Jupiter + his thunderbolts until Jupiter crushed him with Mt. Aetna |
