A de-roboticized Sally Acorn appears in the epilogue.

Planet Horribus,

Dienus screamed in pain as Xanazor continued to electrocute him with electric blasts. "I knew that my mind control spell would wear off eventually," Xanazor said. "You took away everything that I loved!" Dienus shouted at him. Xanazor only smirked. "You were a fool to turn against me, and it was already too late to turn back since you did commit many atrocities," he said.

As Dienus was continuing to get electrocuted, the only thing that could ease his pain was thinking of his childhood memories of the time he spent with Celestia and Luna and him growing up all the way to his corruption by Xanazor.

"I'll avenge every single living being that you hurt!" shouted Dienus and he gathered a tiny bit of strength to resist Xanazor's electric blasts and jumped at Xanazor only for him to hold Dienus in a telekinetic hold and fling him to the ground and continued to electrocute him.

"My ascension has come," said Xanazor as he looked at his generals and the three energy sources around him. "Commence," he said and he, his three generals and the dark energy sources all hovered into the sky and fused together in a flash of light and when it cleared, Xanazor looked completely different. He still had his head shape but his skin was grey will red markings on them and had two other heads and several cobra heads coming from his torso and spread out his giant wings. "The reclaimation of what has been lost begins," he said and unleashed an red energy wave which opened many portals and caused Kronosian ships to materialize and go into the portals to invade the dimensions.

---

In all the four dimensions, portals all formed in the sky and Kronosian ships which were shaped like swords all came out and rained down destruction and deployed Kronosian units to invade and conquer. everybody was all running in terror from the Kronosian menace.

---

Equestria,

In the skies, many portals opened and many ships that looked like swords all came out which deployed Kronosian units to attack the ground below. "Xanazor must have transformed into his final form," said Twilight Sparkle. "Then, you must go and stop him," said Celestia. Meanwhile, Kronosian dragons and behemoths fired blasts at Canterlot while Kronosian warriors and Kronosian wolves climbed up and Kronosian flyers flew up and many ponies were running in terror from their Kronosian attackers. The same was for Ponyville. "Xanazor really will pay for what he has done," said Finn. Then, Finn's disk sounded and he pulled it up to see that is was Princess Bubblegum.

"Finn, the Kronosians are invading Ooo and probably several other dimensions!" she shouted frantically. "We know and we've got the gems of Light and all the energy sources," said Finn. Bubblegum gave a sigh of relief. "And that's why we're going to stop him right now," said Finn.

Then, he and the others went to the Gems of Light, the Chaos emeralds and the Elements of Harmony and all the three energy sources all hovered above Finn, Jake, the Mane Six, Sonic, Shadow, Silver and Gumball and Darwin and enveloped the thirteen of them in an energy and they transformed. Their hair was flashing white and then gold and Finn's clothes seemed to be golden, the same was for Gumball. "I look so coooool," said Gumball, admiring his new color and appearance. "Now's not the time for admiring, it's time to save our worlds," said Sonic and the thirteen of them all flew into one of the portals to confront Xanazor while all the rest of the group could do was hope and also defend against the Kronosians.

---

Planet Horribus

Boss music: Dark Gaia phase 2

The group all arrived at Planet Horribus and found many Kronosian ships materializing out of nothing and heading into portals but most importantly, they saw a huge energy vortex coming from a bright red glow and headed over to confront it.

As they flew closer and closer to the glow, they could see the being at the center more closely and it was Xanazor. Although Xanazor was in his third form, they could still recognize it was him.

Xanazor immediately noticed the white-golden glows headed for him and upon closer inspection, saw that it was Finn, Jake, Twilight sparkle, Rarity, Fluttershy, Rainbow Dash, Applejack, Pinkie Pie, Sonic, Shadow, Silver, Gumball, and Darwin. Xanazor didn't hesitate to strike and each of his snake heads all fired homing shots at the heroes and they scattered but a few of the homing shots hit them, and it was Gumball and Fluttershy who got hit. Despite the hits, they could still continue.

"This is for Susan Strong!" shouted Finn as he hurled a blast at one of Xanazor's heads. Xanazor took the shot and growled and fired an eye laser at Finn only for Jake to sweep Finn out of the way.

Angered, Xanazor fired a wave of dark blasts at the group and struck several of them, but they still proceeded despite the pain. Xanazor then charged a huge blast of energy from all his eyes and fired at the group but they scattered and Finn flew close enough to land a flying kick to Xanazor's chest while Sonic, Shadow, and Silver all threw Chaos Spears at the same time at Xanazor, and the attack harmed him more. Xanazor gave a loud roar and his snake heads snapped at the hedgehogs but Sonic spin-dashed through the one that snapped his way, killing the snake head.

Xanazor then switched his head to the one with a single horn and charged at them only for everyone to avoid and Rainbow Dash and Fluttershy all very quickly, flew behind Xanazor and charged into him faster than he could expect them and cast him onto the ground.

Twilight and Rarity all charged up a energy ball and fired it at Xanazor, but he repelled it with a dark energy blast and then flew up and utilized his telekinetic powers only to find that they were immune to his telekinetic powers. With great rage, Xanazor fired a huge beam at them with all his might and it injured Jake and Fluttershy and Darwin.

Smiling at the fact that some of his targets were hit, he was about to charge another blast only for Silver to fire his own Chaos blast and cause Xanazor's blast to backfire on him.

Then, Xanazor directed several Kronosian ships, Kronosian dragons, Kronosian behemoths, and Kronosian flyers to attack the group and they all came in a large swarm and all the flyers piled on top the group and the dragons and ships all gathered around the pile, ready to destroy the group only for the pile to explode in a huge blast of energy and destroy the Kronosians and then, they destroyed all the Kronosian behemoths.

Seeing this, Xanazor used his telekinetic powers to raise several rocks and the remains of some Starrunner structures to try and kill the group only for them to get past some of the rocks or destroy them and Sonic and Rainbow Dash both super-charged into one of Xanazor's eyes, causing him to roar in pain.

Then, Finn gathered a ball of energy into his sword and shot it at one of Xanazor's horns, blowing it off.

When Gumball and Darwin flew to get a clear shot at Xanazor, one of his snake heads snapped and bit Gumball but the snake head and the others were all quickly killed with a barrage of blasts that Darwin shot from his fingertips.

Twilight levitated a huge chunk of rock and a fallen building and shot it at Xanazor who repelled it only for a combined Chaos attack to hit him and cause him to stumble.

When Xanazor got up again, Finn sliced off one of his wings, and said, "This is for Lorina," while he did that.

"This ends now!" said Finn as he went back to the group and they all put their energy into creating a huge ball of energy that expanded and expanded and they fired the blast at Xanazor and before they fired, they all said to Xanazor, "This is for everyone that you killed," and fired it at Xanazor who attempted to keep the blast from coming but was ineffective and the blast enveloped him, destroying him and creating a very big explosion which sent out a huge shockwave that spread across the entire multiverse. "This feels like the Genesis Wave that Eggman fired," said Sonic when the wave went though them.

Across the four dimensions, every single Kronosian were all wiped out by the shockwave, leaving no trace of them and everyone all cheered in victory at the sight of the Kronosians being gone.

Back on Horribus, there was nothing left of Xanazor but the dark energy sources and several pieces and his general and Queen Chrysalis and a few portals each leading to each dimension. The generals and Queen chrysalis awakened and Serpentius was very shocked to see that they were in their powerful forms. "No hard feelings?" he whimpered. The thirteen of them looked at them angrily. "Help us," said Serpentius to Queen Chrysalis but she immediately jumped into a portal leading to Equestria while Dienus left the generals and went to the side of the heroes. "You traitor!" shouted Serpentius but after he said that, the group all fired a combined blast at him and Optis, killing the two of them.

"Yes, it's done, Xanazor is finally gone," said Dienus.

Note: one more chapter to go and also, the shockwave unleashed by Xanazor's demise not just affected the four dimensions but also affected six other dimensions as well and weakened some dimension barriers. The six other dimensions will be shown in the epilogue and will appear in a sequel.