The New Atlantis

The Dark Hand in Rome releases the Water Demon. Jackie and Uncle chases after her with the Chi Spell, while she escapes to Valmont's hide out. There she learns of the San Francisco Vault and plans to use it to flood the city while Valmont wanted Shendu out of his body because of all the gruelling activity that Shendu is doing to his external features.

Synopsis excerpt via Kitsu.