Chapter 1: Shadows in the Dark
The Titans ran a training exercise with Joey as the villain. They had him captured, but Raven appeared and he possessed her. She disappeared and Joey appeared in her place. Stunned, he got up and began signing like mad - he felt the evil inside Raven and asked why no one had helped her. The Titans went inside and discussed it. Jericho talked to Raven. Raven announced to the team that she was leaving. They wanted to help, but she vanished.
On Tamaran, it's people celebrated the defeat of the Citadel. They sent a ship for Korniand'r, who could now return in peace.
Cyborg showed Changeling some footage of Raven - she'd been physically changing since they'd known her. Joe became more worried about Raven and felt he could help. He went into her room and again possessed her. Inside her, he saw Trigon, who was trying to get his daughter to rule at his side. A storm struck and woke the Titans up. Smoke was coming from Raven's room. Inside, they found Joey, who signed for them what he'd seen.

Chapter 2: Bow before Trigon the Terrible
Wonder Girl told the Titans that darkness had covered the entire Earth. Lilith returned to the Titans to aide them in finding Raven. Dick handed her Raven's rings, which were given to her by Azar. They'd never seen her without them. As soon as Lilith touched them, the room exploded. The Titans were able to get out safely, but realized they must get back in if they were to ever reach Raven. Dick and Donna went to find Wally. Despite Fran's objection, Wally returned with them.
Back at the tower, Lilith held a seance. The group was teleported to Azarath, now in ruins. As they watched and attempted to save everyone, Azarath was destroyed. Wally's leg muscles gave him fits, but he fought through it. He and Lilith were in the temple when it was destroyed.
Back on Earth, the sky opened up above Titans' Tower. Dragons flew through, then Raven and Trigon. Her skin was now red and she had four eyes, like her father.

Chapter 3: Souls as White as Heaven, as Black as Hell
Trigon spoke from atop Titans' Tower: anything in defiance of him would be treason and punished by death. The Titans, with Arella (Raven's mother), returned to Earth to face Trigon. He had already began reforming it in his own image. Raven, now completely under Trigon's influence, attacked her friends. Jericho tried to possess her, but failed.
Nightwing found himself in a lab. There, he found Batman dead. Jason (as Robin) was begging forgiveness - he'd not been good enough to save his mentor. Another Nightwing appeared, telling Dick that he had to go back to being Robin at 12 years old in order to save the Batman. Dick punched out the shadowy Nightwing. The rest of the Titans, too, faced dark dopplegangars killing their loved ones.

Chapter 4: Torment
The Titans continued to fight the shadows of themselves. Wally was the first to kill his, therefore his soul belonged to Trigon. Shortly, all the Titans turned dark. Lilith, not Trigon or Raven, controlled them. She put them up against Raven. They killed her, awakening Trigon.

Chapter 5: The Terror of Trigon
The Titans realized they were quite possibly the last living beings on the planet. They attacked Trigon knowing he would kill them anyway. Trigon defeated them all - only Lilith and Arella stood between Trigon and complete victory. Kory somehow saved the Titans. Lilith, possessed by Azar, placed the rings on Raven's fingers. She lived. The Titans attacked Trigon.
Azar's power, along with the souls of all Azarath, used Raven's body to destroy Trigon. Earth was renewed, but Raven was gone for good.