Dark clouds rolled across the pastel skies of the Land of Ooo, blotting out the sun in uneasy waves. The wind carried a low, distant hum—like something vast and hungry stirring far beyond the horizon. All across Ooo, magic misfired, portals flickered, and ancient artifacts began to glow as if responding to a single, terrible call.

At the top of a grassy hill, Finn stood with his sword planted in the ground, staring out at the shifting sky. “Jake… Ooo’s never looked like this before.”

Jake stretched beside him, his usual grin absent as his eyes followed the crawling shadows overhead. “Yeah, man. This isn’t normal bad. This is, like… end-of-everything bad.”

Far away, a shockwave rippled through the land. Mountains trembled, the seas pulled back unnaturally, and the Candy Kingdom’s alarms rang out in frantic rhythm. In the Ice Kingdom, the crown screamed warnings only its wearer could hear. Even deep in the Nightosphere, something old and cruel smiled.

In Princess Bubblegum’s war room, maps of Ooo were covered in blinking lights and unstable readings. PB slammed a hand onto the table. “This threat isn’t just attacking Ooo—it’s trying to overwrite it. Reality, magic, history… all of it.”

Finn’s eyes widened. “So… big team-up?”

PB hesitated. “Bigger than you think.”

One by one, figures began to arrive.

Marceline, leaning silently against the wall, her bass humming with dark energy. Princess Flame, fire flickering nervously at her fingertips. Ice King, muttering anxiously, clutching a bundle of old notes that might actually be useful this time. Even former enemies—faces Finn had fought before—stood uneasily at the edges of the room, drawn by the same looming catastrophe.

Jake folded his arms. “Never thought I’d say this, but… we’re gonna need everybody.”

A massive tremor shook the room. Outside, the sky裂 open briefly, revealing a vast, shifting shape beyond space—something that did not belong in Ooo at all.

Princess Bubblegum looked around at the gathered heroes and villains alike. “Whatever this thing is, it doesn’t care who you are. Only whether you exist.”

Finn tightened his grip on his sword, stepping forward. “Then we fight together. Heroes, villains, weird guys—everyone.”

The ground shook again.

Somewhere out there, the new threat was awakening—and Ooo’s fate now rested on the most unlikely alliance it had ever seen.