Roku was flying over a body of water on Fang, as he approaches land. As Roku flew over, he saw an Earth Nation dock then he saw an Earth Nation fortress with plumes of smoke rising from inside, with the Fire Nation insignia strewn over the original Earth Kingdom symbol, covering it. Roku widened his eyes in shock by his discovery.

Later Roku burst through the doors of Fire Lord Sozin's throne room with steam coming out. Roku's shadow in the doorway was cast on the long red carpet.

Roku was angry. "I've seen the colonies, Sozin." He pointed at Sozin. "How dare you occupy Earth Kingdom territory!"

Roku walked up to Sozin.

"How dare you, a citizen of the Fire Nation, address your Fire Lord this way." Sozin said. "Your loyalty is to our nation first. Anything less makes you a traitor."

"Don't do this, Sozin. Don't challenge me. It will only end badly. It's over." Roku said.

As Roku turned back and started to leave, Sozin, full of rage, jumped from his throne and delivered an immensely powerful fire stream. As the flames went out, Roku was nowhere to be seen. Sozin widened his eyes in suprise, expression becoming blank as he looked around. Suddenly, Roku burst from the ground behind Sozin, revealing that he had burrowed into the ground with earthbending to defend from Sozin's attack. Before Sozin could turn back, Roku delivered a powerful air blast at the Fire Lord, which caused him to slam on the gates of the room. As Sozin fell down, Roku immediately earthbended a pillar of earth that lifted Sozin into the air and pined him by the back of his robes to the ceiling. Avatar Roku brought his hands together in front of his face, and entered the Avatar State. Roku broke the pillars of the throne room. The palace was destroyed. Sozin uncovered his face. Roku airbended an air spout, and raised himself to Sozin.

"I'm sparing you, Sozin." Roku said. "I'm letting you go in the name of our past friendship. But I warn you. Even a single step out of line will result in your permanent end."

Sozin stared at Roku, his face still full of anger. Suddenly, his expression dropped, and he hung his head in defeat. Roku turned, and rode the cyclone quickly away from Sozin.

"Sozin and I didn't speak or see each other for twenty-five years after our battle." Roku said. "I spent most of my spare time here, at my home."

An elderly Roku and Ta Min were sleeping, as a loud noise awoke Roku and he leapt out from the bed, and looked through the window. Large fireballs fell from the sky, and crashing into the island. Roku and his wife fled the room, but as they did so, Roku's headpiece falls to the floor, and was left behind. Roku emerged from the house to find the air filled with smoke and ash. Coughing, Roku and his wife shielded their faces. A worried Roku looked at the erupting volcano in the island.

"Let's go!" Roku caught his wife's hand, and airbended smoke and ash in their way, creating a path, as both ran through the path he created.

In the town, as the townspeople ran through the streets to escape the waves of smoke and ash that now poured through the streets. At Roku's home, Fang flew up from behind the house. He narrowly escaped as an ash flow completely buried the house. Roku, with his face covered, lead his wife and many townspeople to safety. Ash continued to fall as a swell of lava oozed from the mouth of the volcano. Roku was still running. He looked to his wife, as she ran. He let go of her hand, and motioned her to go on without him. With her arm still outstretched, she looked at him, and ran to safety. She continued to look back, desperately hoping Roku would grab her hand. Ta Min ran off with many of the townspeople. Roku turnd to face the advancing smoke, and airbended a huge dome of protection around himself. The townspeople in boats, as they saw the air dome. There were the worried faces of the people, including Ta Min. The volcano erupted in the island and at the Fire Nation Palace, an elderly Fire Lord Sozin watched from his balcony.

"Roku's island was a hundred miles away. But I could still feel it rumbling and see the black plume of smoke. I had never seen anything like this catastrophe." Sozin said.

Large columns of black smoke billowed from the summit, as lightning struck above the volcano and the earth rumbled from the disaster. A landslide quickly approached the town, destroying it completely. Roku earthbended a gigantic wall, and rode the wall to meet the falling earth, and stop it. As he succeeded in stopping it, the volcano ejected a massive wave of lava. The flow breeched the wall of earth, causing Roku to flee to the bottom of the summit. He cut into the earth using his earthbending, creating a channel to divert the lava into the surrounding ocean, away from the town. The channel filled with lava, and emptied into the ocean. Roku and Aang watched the destruction from a distance.

"This is amazing, Roku! You're battling a volcano, and you're winning." Aang said.

"Unfortunately, my success didn't last long, Aang. There was no way I could do it all." Roku said.

Roku looked up the top of the volcano. The volcano violently expelled another giant wave of lava. Roku ran toward the volcano, and leapt. Roku blew a powerful blast of air from his mouth at the lava, which cooled and hardened, as Roku landed on it. Suddenly, a blast of poisonous gas spouted to his right, he turned and covered his face. He turned to the jet, airbending it away. Suddenly lava appeared on his right, which he airbended, and quickly another jet of gases blasted to his left, and he quickly airbended it as well.

"Battling the elements was hard enough. I had to do it while I could barely breathe. The poisonous, volcanic gases were overwhelming." Roku said.

Lightning crashed around the crater as Fang came, flying. The summit emitted another lava fountain. Fang pulled back, narrowly escaping the blast, and roared.

Roku airbended a a jet of gases. "It's all right Fang!" He coughed. "Get out of here! I'm fine!"

Roku turned his body from side to side, and entered the Avatar State. With a powerful blow from his fist, Roku earthbended a tremor through the volcano, breaking out the back side of the crater, which lessened the lava flow. As the lava flowed down, the second volcano erupted, as Roku, no longer in the Avatar State, hopelessly dropped his head. Sozin, on a blue dragon, appeared.

"Need a hand, old friend?" Sozin said.

A surprised Roku turned back. "Sozin?"

"There's not a moment to waste." Sozin said.

Sozin and Roku rode on the Fire Lord's dragon's back to the second volcano. Roku bended the fire fountain down into the crater. Sozin balanced on the mouth of the vent, as he cooled the lava by absorbing the heat, passing it through himself, and redirected out through his other hand. The silhouettes of the two friends, controlling the disaster. The townspeople in the boats, as they saw the volcanoes erupting. Ta Min had an anxious expression on her face. Roku and Sozin were on the edge of the crater. Lightning blasted above Sozin, as the earth beneath him became unstable. He began to fall back off the side of the volcano, but Roku quickly earthbended an earth shelf to catch Sozin. Stable again, Sozin looked to Roku for a moment. Suddenly, the earth violently shook and another surge of ash and rock shot from the crater, and the two turned to run.

"Don't breathe the toxic gas." Roku said.

As the two ran, a jet of toxic gas shot up directly next to Sozin. Roku quickly airbended it away to protect Sozin. Suddenly gas erupted directly into Roku's face, causing him to be disoriented.

Roku lifted his hands to look at them, as they blurred out of focus. "It's too much."

Overwhelmed by the poisons, Roku fell to his knees. He looked up toward Sozin, and held out his hand for help.

"Please." Roku said.

Without you, all my plans are suddenly possible." Sozin said. "I have a vision for the future, Roku."

Sozin's dragon appeared. As Roku knelt, Sozin mounted the dragon and flew away. Roku was on the side of the volcano. He was surrounded by toxic gas, and behind him a surge of rock and ash flowed swiftly toward him. The black clouds billowed from the island, as Sozin's dragon emerged from the plumes. Roku was still on his knees. He was coughing, and was unable to get to his feet. Fang appeared from the right, and flew above him. Roku looked up toward his dragon. The debris was rapidly approaching Avatar Roku. With the rock avalanche just moments away from swallowing Roku, Fang flew down, and wrapped himself around Roku. The wave of ash and rubble covered the two completely, killing both of them. A baby's cries could be heard. There was a smiling born infant.

"Who's ... wait, that's me, isn't it?" Aang said. There were three Air Nomads. A nun held up the baby to the light while two people, presumably the infant's parents, stood in the shadows.

"Make sense of our past, Aang." Roku said. "And you will bring peace, and restore balance in the world." He slowly disappeared.

"Roku? Roku!" Aang said.

Aang walked out of the flashback into whiteness

xxx

Zuko was reading in the Dragonbone Catacombs.

"With Roku gone, and the great comet returning, the timing was perfect to change the world." Sozin was standing on a balcony, from the behind, looking at his soldiers and the Fire Navy ships. "I knew the next Avatar would be born an Air Nomad. So I wiped out the Air Temples. But somehow, the new Avatar eluded me. I wasted the remainder of my life searching in vain. I know he's hiding out there somewhere. The Fire Nation's greatest threat ... the last airbender."

Zuko looked into the water, and saw Kurai's face staring back at him in shock.