The following contains spoilers from Yoda #4, on sale now from Marvel Comics.

Darth Sidious was Star Wars' master schemer. He infiltrated the Republic and destroyed it from the inside, but Sidious did a lot more than that. Over the years, he had a few apprentices, and unlike Darth Bane, he made a point to manipulate every one of them. Fans know that he coerced Anakin to the Dark Side, but some fans may not know that Count Dooku was manipulated in a similar way.

Like Anakin, Dooku started out as a Jedi, and he was committed to helping the galaxy be a better place. Yet, he believed that the Jedi were too committed to the corrupt Republic. So, he eventually left the Order. After that, it wasn't hard for Darth Sidious to convince him to join the Sith by championing a course correction for the Republic. Now, Yoda #4 (by Jody Houser, Luke Ross, Nolan Woodard, and VC's Joe Caragagna) has shown that Dooku had another, major problem with the Jedi. They abandoned his best friend, Sifo-Dyas.

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Yoda Abandoned Count Dooku's Best Friend

Yoda and Dooku Talk about Sifo-Dyas

After the first few issues of the Yoda solo series spent time in the High Republic, Yoda #4 jumped to Yoda's time with Jedi Master Dooku. Together, they spent time giving lightsaber lessons to a group of younglings. After they finished, Yoda asked what Dooku thought about the students, but that quickly turned into a different conversation: Master Dooku's best friend, Sifo-Dyas. Sifo-Dyas (who was originally created by a typo) and Dooku were best friends growing up in the Jedi Temple. They lived together and got into trouble together, but Sifo-Dyas had a problem. While he was an apprentice, the Force started to grant him detailed visions of horrifying, future events. Unfortunately, Yoda and the prequel era Jedi didn't like visions.

They believed that acting on them was harmful because it was an example of trying to manipulate the future. So, Jedi that were given visions were kind of ostracized. In Yoda #4, Dooku asked his former master if Sifo-Dyas was doing any better, but he wasn't. Yoda simply said, "Much time he spends, lost in his visions of the future." That was disappointing for Dooku, but he still wanted to make a point. He believed that the Jedi Council should have been using Sifo-Dyas' visions as a way to understand what people in the galaxy needed help. To that, Yoda refused. He said that visions represented possibilities of the future, not certainties. In that way, rushing to act on a vision would be acting on fear, which could lead Jedi astray.

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Yoda Ostracized Jedi with Force Visions

Sifo-Dyas scowls with blood red eyes in The Clone Wars.

Thus, Yoda abandoned Sifo-Dyas. Yoda admitted that he had a "difficult path," but it was all for naught. He simply had to suffer through his terrible visions. That was just one more reason that Dooku decided to leave the Order. His best friend had been given a gift that could have allowed the Jedi to help countless people, but Yoda refused to act. As a Jedi, Dooku couldn’t stand the thought that his best friend was suffering without a purpose, so he hated Yoda and the Jedi Order for that.

In the end, though, Yoda was right. Before the events of The Phantom Menace, Sifo-Dyas had a vision of a galactic war. So, he secretly commissioned the Clone Army for the Republic. However, Dooku and Sidious undercut those plans, killed Sifo-Dyas, and nearly destroyed the Jedi with the Clone Army. If Yoda had been able to prevent Sifo-Dyas from commissioning the Clone Army, then Darth Sidious wouldn't have been able to start the Clone Wars or execute Order 66. The visions had only led Sifo-Dyas to fulfill his own prophecy.