In his early twenties, Dooku was already capable of executing the Force Lightning attack to combat enemies, and defeated an equally legendary Jedi in Sifo-Dyas with one hand and no vision.

A Jedi mission finds a lightsaber belonging to the long-dead Master Sifo-Dyas, prompting Yoda, Obi-Wan Kenobi, and Anakin Skywalker to begin an investigation into his decade-old disappearance.