While investigating dinosaur-like creature attacks on the planet, Joe runs into old childhood friends who may not be so friendly anymore.

As the Yomi arc continues, the team reluctantly takes in a young woman with amnesia, while 008 has mixed feelings after Dr. Gilmore saves his life at the expense of becoming even less human.

With two telepathic sisters helping them, the 00 cyborgs discover the entrance to Yomi, the underground empire, but at the cost of the Dolphin.

In the underground empire, 009 is hypnotized and forced to attack his comrades, while Skull is back after being presumed dead.

Black Ghost's giant statue wipes out the underground empire, while Van Vogt rounds up the traitorous telepathic sisters right before the helpless cyborgs' eyes.

In the final episode of the Yomi arc, 009 fights Skull and the true masters of Black Ghost aboard their giant statue in space.