Dr. Phineus Phibes

The Darkness God or Nemesis is the true main antagonist of Cillian Darcy vs The Royal Darcy Family wants to destroy the world but he revealed to be Dr. Phineus Phibes, the main antagonist of the Scooby-Doo TV series, Shaggy and Scooby-Doo Get a Clue. He is a evil scientist obsessed with becoming immortal. He revealed to be "The One" that the Darcy Triplets can't defeat. He is serves as the main and final antagonist of the Darcy Triplets Story who plans to uses Ellie's body to take over the world.