Complete story — includes the ending
Jedi Master Sifo-Dyas died under mysterious circumstances years ago. When a secret Jedi mission accidentally finds his crashed ship and lightsaber, Anakin Skywalker, Obi-Wan Kenobi, and Master Yoda investigate Sifo-Dyas's death again. To keep them from uncovering the Sith conspiracy, Darth Sidious orders Dooku to erase all traces that links up to the murder investigation. This is successful and Dooku escapes shortly after Obi-Wan and Anakin learn that he was the one who killed Sifo-Dyas under his Sith alias "Darth Tyranus", the same name under which he commissioned for the clone army. Now knowing that Dooku had a hand in creating the clones, the Jedi decide to keep the knowledge to themselves to avoid widespread panic and confusion until they know more.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, List of Star Wars: The Clone Wars episodes. HTML formatting and reference markers removed. · Content license