The deafening crash of shattering concrete and crunching metal echoed through the streets as the foot of the gigantic, dinosaur-shaped mecha descended to the ground, leveling a storefront like a sand castle. The city of San Fransokyo was once again ablaze, being torn apart by a mechanical monstrosity unlike any it had ever witnessed. And mechanical monstrosities were nothing new– San Fransokyo seemed to come under attack from some new threat every year. First Callaghan's mad revenge plot, then Krei Tech's screwup with the V.I.L.E. system, then Yama's new giant battle bots... This, however, surpassed every previous threat the Big Hero 6 had ever seen.

"Why aren't we doing any damage to it?!" shouted Wasabi, frantically trying to embed his lightsaber gauntlets in the mecha's armored plating only to be solidly deflected.

"Oh, I have no idea. Maybe it could have something to do with this thing being a thousand feet tall?!" responded an exasperated Gogo via her com-link.

"Baymax and I already scanned it," said Hiro as he circled the mecha. "Even with the Bot Scanner upgrade I installed, we can't get any information on what it's made of except that it's called the 'Juggernaut'. I don't know how that could– whoa, Baymax, PULL UP!" Hiro was interrupted as a terrible blast of fire streamed from the Juggernaut's mouth, and narrowly managed to swerve away in time.

"You call THAT fire?! Here's some fire, wimp!" Fred shouted from atop the Juggernaut's back, unleashing his own fire breath on the mecha's neck. Not surprisingly, it was completely ineffective at first like all their other attacks. As Fred kept it up, however, the metal eventually began faintly glowing red, to his surprise.

"HEY! GUYS! I THINK I FOUND HIS WEAK POINT– UGHHH–" His announcement was cut short by the Juggernaut's tail slamming into him, sending him flying off its back and through the window of a nearby building. Several hatches opened near the base of the mecha's neck, revealing a number of gun turrets protecting the supposed weak point.

Gogo facepalmed. "...Next time, how about not telling him what we're about to do?"

"Sorryyyy..."

"Baymax, run an X-ray scan," said Hiro.

"Scanning..." Baymax replied. "My scan results indicate that Juggernaut's armor is much thinner at the neck area and made up of multiple jointed plates to allow for ease of head movement."

"So that is the weak point..." said Hiro. "...I have a plan. Honey Lemon, Fred, see if you can take out the turrets from a distance while I distract him."

"Gotcha!"

"Gogo, Wasabi, you two go for the neck once we've softened him up."

"All right!"

"Baymax, dive!" Hiro commanded, and zoomed towards the Juggernaut. Each and every turret turned as one towards him, and let fly with a blistering laser barrage so dense that Hiro could barely see what was coming. More than once he had to barrel-roll to avoid getting blasted right off Baymax's back. As Honey launched one acidic paint grenade after another at the turrets, Fred ignited them as they flew by. When each one struck the Juggernaut, it exploded, covering the turrets in flaming, corrosive fluid. The turrets, it seemed, were not as durable as the rest of the mecha, and the onslaught against Hiro thinned as the turrets were slowly melted into uselessness.

"Nice work!" With the lasers gone, Hiro flew over the Juggernaut's head, heading straight for its tail. "Baymax, grab it!" Baymax did so upon collision, driving the tail into the ground with a crash, where it was immediately struck by another paint grenade from Honey Lemon, this one expanding and solidifying on impact, holding the tail in place.

"That won't hold it for very long! We gotta hurry!" said Gogo as she zoomed up the Juggernaut's tail and its back on her blade skates, slashing its already-heated neck armor vertically as she ran over it, and launching into the air off its head with a backflip. As she began to fall back down, Wasabi rushed in, wedged his lightsabers between the plates, and slashed horizontally, severing the joints. He jumped back down from the Juggernaut as Gogo landed, slicing the plates in half vertically in her way, and causing the mecha's entire neck armor to fall to the ground below in several pieces with a series of deafening CLANGs. Its inner frame and machinery were now visible through the gap.

"This is it! Baymax..." Hiro circled around and aimed for the back of the Juggernaut's head. "...ROCKET PUNCH!" Baymax's fist flew toward the mecha, and into the gap. A shower of sparks erupted from its neck as its head jerked back from the impact, severing its frame and breaking the wires. As Hiro and Baymax flew up out of the way, the Juggernaut's glowing eyes flickered, dimmed, and went out.

"We've done it! Nice shot, Baym–" Hiro was unable to finish his sentence, for what he saw when he looked into the sky ahead of him stopped his breath. The dark red sky was filled with millions of thick, writhing tentacles, stretching from one horizon to another. In the center of all of it was a colossal humanoid figure backed by a halo of golden machinery that made Hiro's mind hurt to even look at it. Most terrifying at all was its face; an empty black void that stared into his very soul. Baymax continued flying onward, toward this thing in the sky; Hiro could not scream, or do anything; he was frozen in absolute, indescribable terror. A voice emanated from it, a terrible, monstrous voice that sounded like countless voices layered on top of each other...

"Hear me, restorer of life..."

"My children, my creations..."

"Whom thou hast turned against me..."

Darkness began to envelop Hiro from all sides. Hiro could hear a single voice through all this, a voice very familiar to him... No. No. He's gone. He's gone. He's gone. He's gone. He's gone.

"I am Maxwell."

"Now, let forth the God of Destruction!"

Hiro gave up trying to fight the fear. He fell forward against Baymax's back, and let the darkness wrap him in its folds, as everything faded into a warm, comforting white light.