Related Clues:
- Mythical monster
- See 21-Across
- Serpent with nine heads
- Nine-headed serpent of myth
- Nine-headed serpent
- Many-headed serpent
- Multiheaded beast slain by Hercules
- Hercules victim
- Monster in the second labor of Hercules
- Lorry fuel
- Many-headed monster
- Monster slain by Hercules
- Sea Serpent constellation
- Many-headed monster slain by Hercules
- Mythical serpent