Mnemosyne was one of several Titans chained underneath the world by the Olympians. She was briefly released by Hera. (Hercules and Xena - The Animated Movie: The Battle for Mount Olympus)
When seeking information on how to stop Dahak, Hercules sought out Mnemosyne who is trapped in a fiery cave. Aside from Zeus, she is the only living being that was around to witness Dahak's first defeat and is accessible from the mortal realm. Hercules talked with her to learn about the Titans' war with Dahak a thousands years before. (HTLJ: "Let There Be Light") Unlike most of the titans, Mnemosyne retained mortals following after her imprisonment and was worshiped as the goddess of memory. The Temple of Mnemosyne, as the name implies, was the center of her worship. (XWP: "Forget Me Not")
Mnemosyne in Xena
Mnemosyne as the goddess of memory has a cult, temples, worshipers and the mortals tormented with his bad memories, They have the option of going to the temple and seek help from the goddess. In the temple the person start a journey, inside his subconscious of memories, to get answers or the option to erase their memories and start over.
Appearance in Hercules
Mnemosyne is a fire titaness, she is shown as having a humanoid yellow body, with fire as hair and burning on her arms. Her form is later altered by Hera, giving her a devil tail, long brown hair, markings on her face, bestial legs and very sharp claws. She meets her end when both she and Tethys charge Ioalus from opposite directions, Ioalus jumps out of the way at the last second, causing Mnemosyne and Tethys to collide. The two Titanesses are then kicked off Olympus into tartarus.
Powers and Abilities
Power over the fire: Mnemosyne has the ability to create and manipulate fire. ( In Hercules )
Power over the memory: As a goddess of memory, Mnemosyne has the particular power to make the user enter his subconscious and face his memories, being the user aware. She seems to have great power over memory manipulation and understand how works, the plane / world of memories. ( In Xena)
- Mnemosyne was voiced by Alison Wall in her animated performance and Claire Stansfield in Hercules: The Legendary Journeys. Donogh Rees, who previously played Frigga, provided the likeness for the CGI version in "Let There Be Light."
- Mnemosyne's live-action appearance is highly consistent with that of her animated one, unlike Crius. This is probably because Mnemosyne's live-action appearance occurred after the animated film was released.
- In classical mythology, Mnemosyne (Greek Mνημοσύνη), was a Titaness, was the daughter of Gaea and Uranus. She was the personification of memory and with Zeus, was the mother of the nine Muses.