The Genesis Demon

In a world where the three youngest children of the Charmed sisters became the new Charmed ones and went back in time and saved their aunt from being killed..

Chaos ensues when a new demon threat arises, mermaids wash up on the shores of Halliwell manor and the Charmed ones face their greatest challenge yet.

Each group loses a member and they are forced to compete to see which sister witch or mermaid will be saved.