Inside the dark halls of the Foot headquarters, Guest sat chained near a glowing tank of bubbling green ooze—the infamous mutagen. The air was thick with tension, and the fluorescent hum of the tank echoed through the chamber like a warning. Their wrists ached, their thoughts racing. Betrayed by their own blood. Punished by their father, Shredder, for something as simple as friendship. They had tried to hide it, their connection to the turtles. But secrets don’t last long under Shredder’s rule. Of course, eyes were everywhere! Literally everywhere, if you were under the Foot Clan, let alone being Shredder's child. His only heir.
“You were a fool to think you could play both sides, Guest..”, Shredder growled from above, eyes cold and unforgiving beneath his metal helm. “Why must you betray your own father like this? After all I've done for you, my child.. you are still ungrateful as ever.", Shredder shakes his head, his hands are behind his hips as he walked down the carpeted floor. "I raised a warrior, not a traitor."
Guest struggled against the chains. “But father! They’re not the enemy! They saved me more times than you ever have!” Shredder didn’t respond. He just stared—first at Guest, then toward the hallway… as if he was already watching the brothers storm through it.
Baxter Stockman, pacing nearby, sneered. “This is a waste of time. You know what must be done, Shredder!", he snapped, clearly done with the bull, which caught Shredder's attention instantly. “Stockman..! Don't you da—” Shredder began.
But Baxter had enough. He had enough waiting. It's killing him! With a sudden, forceful shove, he slammed his palm into Guest’s chest and hurled them backward—straight into the mutagen tank.
"AH?!"
Glass cracked. The ooze hissed violently as Guest crashed into it, submerged in the glowing liquid. Alarms blared.
“Guest!!” Leonardo’s voice rang out as the turtles charged into the room. "NO, NO, NO!!! WHAT HAVE YOU DONE?!", Raphael's panicked voice raised up towards the mutant fly, Stockman himself, baffled with anger bubbling up inside him. Watching their friend getting mutated right in front of their eyes is the last thing they would want to witness in their life.
Green light erupted from the tank as the mutation process kicked in without protocol or control. Chains melted. Guest’s body convulsed, caught in the grip of transformation. Their scream echoed through the chamber, raw and half-human.
“What did you do!?” Donatello shouted, rushing to the tank’s controls. Baxter backed away with a sick grin. “A necessary adjustment to your stupid human friend.”
Even Shredder stood frozen.. his gaze fixed on the bubbling tank, jaw clenched, eyes slowly turning red from anger as he gripped Baxter by the collar, "YOU IMBECILE! WHAT HAVE YOU DONE TO MY CHILD?!", he growled in anger, his loud voice booming the entire room.
Shredder extended his steel claws, about to attack Baxter for the unplanned mutation, but before he could do so—
CRASH—!!
The tank exploded from a sudden hard impact. Guest fell to their knees in the wreckage, their body mutated, form altered but still recognizable… breathing hard, eyes wild..*
Release Date 2026.05.17 / Last Updated 2026.05.17