Above Earth, a green alien spacecraft floated within the planet's orbit. "Cosmos to Optimus Prime, I am picking up high readings of a space-time anomaly on Earth." the spacecraft transmitted. "Remain posted on the anomaly. We will deploy soon." a voice transmitted back. On the ground, the two forces of the Candy Kingdom and Gumbaldia rejoice upon the dissolution between the two kingdoms' rivalry. "So… I guess everyone's just going home, huh?" "Eeyup." Lumpy Space Princess and Jake talked as Banana Guards return to their encampment.

Just then, a portal in the sky opens and a flaming projectile emerges from it, crash-landing behind Finn, who was next to Princess Bubblegum as she talked to Aunt Lolly. The fire dissipates, revealing the Martian King Man, wearing a top hat, black robes, and a necklace made of tiny skulls. "We donked up for real." he said before passing out. The portal widens above the Gumbaldia forces, and from it a gigantic red creature with a geometrical head with four yellow eyes emerges. "Jake, what am I looking at?" Finn wondered in worry.

"Uhh… we saved the day. So maybe that big baby there's giving us presents for a good job?" Jake suggested. A dark cloud follows from the portal and covers the sky in darkness to the terror of everyone. "Bonnie! What did you do?" Marceline asked Princess Bubblegum as she floated over to her. "It wasn't me!" Princess Bubblegum denied. The creature opens its mouth and gaseous arms emerge, covering the cake soldiers and fusing them into a giant monster comprised of their terrified faces.

"Don't let it touch you!" Lolly warned the remaining soldiers. The monster grabs three and adds them to its mass. "No, I'm a loner!" one soldier pleaded. "Peebs, this is the worst thing ever! If someone doesn't stop this it could be the end of Ooo!" Marceline said worriedly. "You're right, Marceline. I gotta do something!" Princess Bubblegum agreed before running towards a boulder with a flat surface. "Banana Guards! Obey my commands! Flee for your lives! If you fight, the demon will just add you to its mass!" Princess Bubblegum commanded to the Banana Guards.

"Can we flee in panic?" one guard wondered. "Yes!" she responded before the Banana Guards fled. "F.Y.I. Princess, I'm not going anywhere!" Finn said to Princess Bubblegum bravely. "I'm also staying." Jake added as he poked out of Finn's hat. "Thanks, guys." she said in gratitude.

"I'm in too. This is a war I have to fight. We all have to." Marceline said as Lady Rainicorn, Huntress Wizard, and Flame Princess fly above them. "Me too. I'll defend down to my last blade." Fern said as he climbed onto the boulder and unsheathed his grass sword. As the creature approached them, a horizontal green portal opens in the sky above the heroes and what appears to a flying red aircraft carrier emerges. "What's that?!" Finn wondered. On the cliffs, more green portals opens and armies of tall green robots and jets emerges and marches orderly to the edge.

Cannons on their chests pop out and fire missiles at the creature, only for it to swipe them away. They slide down the cliff and more robots, different from the first wave, emerge from the portals. With arm-guns, they fire repeating lasers at the creature as the heroes watch. "Gumball Guardians!" Princess Bubblegum called out to her own giant robots. "Yes mom?" a Gumball Guardian acknowledged. "Assist the other robots and stop that monster!" she commanded, pointing to the creature as it flings the robots around.

"Okay." they said as walk over to the monster, towering over the smaller green robots. From the cliffs, a blue-and-red semi-truck with a trailer in tow and a yellow muscle car emerge from a portal further away from the canyon. The semi-truck shifts its chassis into metal plating before forming into the shape of a robot while the yellow car forms itself into a slightly shorter robot. "What's that thing there?" the yellow robot wondered with a voice resembling a young man as he pointed to GOLB. "According to Martian mythology, it is a deity of destruction, akin to Unicron, called GOLB. If we are able to defeat Unicron, we can defeat GOLB." the blue robot explained in a deep voice, gruff voice like that of an old man.

The trailer splits in two and its contents reveal to be an armoury with a circular arch with weapons. The blue robot walks underneath the arch and the armoury folds onto him, forming wings and jet engines. "Bumblebee, lead the ground troops while I lead air troops." the blue robot instructed to the yellow robot before flying towards GOLB as a squadron of jets follow him. Behind the yellow robot, three green portals open and from them, a yellow Formula car, a green stock car, and a blue stock car emerge before transforming into robots. "Where's tha ac… what in the world is that thing?!" the Formula robot wondered with an English accent.

"Basically Martian Unicron. Follow me." the yellow robot said before turning back into a car and driving off the cliff. The three robots transform into their vehicle forms and follow. As the two Gumball Guardians and the robot army fight the creature The Cake robot approaches and fires a laser from its candle at the creature's posterior, gaining its attention. Nearby Finn tries to wake Normal Man. "Norman Man, come on! Wake up!" Finn yelled.

Normal Man wakes up and sees Ice King staring at the blue robot flying around and opening fire at GOLB to no effect. "That robot looks familiar…" Ice King pondered at the sight of the robot. We flash back to Simon Petrikov's past, when he started out as an archaeologist in the tundra of the Arctic. He was riding on a snowmobile with another man driving when he faintly spotted an object embedded in the snow. "Spike, pull over! I think I saw something." he commanded to the driver.

To be continued…