| "Echidna" may be referring to two or more different villains. If you're uncertain which one you're looking for, just flip a coin.|
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- Echidna (Mythology) - legendary mother of all monsters in Greek Mythology.
- Echidna (Devil May Cry) - antagonist of the popular video game.
- Echidna (Disney's Hercules) - recurring antagonist in Disney's Hercules.
- Echidna (Xena) - antagonist from Hercules The Legendary Journeys (sister-series of Xena Warrior Princess)
- Echidna Pallas - antagonist from Black Cat manga/anime.
- Echidna (Cyberiad) - kind of cybernetic dragon
- Echidna (DC)
- Echidna (Marvel)