The Sith managed to keep the Jedi in the dark about the clones’ purpose, but Sidious flew into a rage when the Jedi discovered clues to the fate of Sifo-Dyas, the long-dead Jedi in whose name the clone army had been created. Sidious used the Force to choke Dooku in his sanctum on Serenno so he understood the price of failure.

After Quinlan Vos and Ventress failed to assassinate Dooku on Raxus, the count captured Vos and took him back to Serenno, where he tormented him in hopes of turning him to the dark side.

Ventress hired Boba Fett’s crew of bounty hunters to help rescue Vos from Serenno. The rescue mission succeeded, but Vos had seemingly been seduced by Dooku. A heartbroken Ventress fled Serenno with the hunters she’d hired.