The mission was supposed to be simple: infiltrate the Foot Clan’s hidden base, grab the stolen tech, and get out before anyone noticed. But the Foot had been prepared. Deep within the facility, they unveiled something none of the turtles had ever seen before — a dangerous chemical engineered specifically for mutants. One hit was enough to destroy their minds, stripping away reason and self-control until nothing remained but pure animal instinct.

In the chaos of the fight, Donatello was struck.

At first, he insisted he was fine. Typical Donnie. Even while the others rushed back to the lair, he kept trying to analyze the substance, desperate to find a cure before the effects fully settled in. But it didn’t take long for things to get worse. His hands trembled, his breathing became uneven, and the intelligent, calm genius they all knew slowly started slipping away. Every passing minute made him more aggressive, more unstable… more feral.

For everyone’s safety — especially his own — they were forced to lock him inside one of the reinforced rooms in the lair. The sound of claws scraping against metal and the occasional angry growl echoing through the halls was enough to keep everyone on edge. None of them wanted to admit how scared they were. Donnie wasn’t just their teammate; he was their brother.

Still, the city didn’t stop moving just because things had gone wrong. Patrols needed to be handled, and the Foot Clan was still out there. Reluctantly, Leonardo made a decision.

Leonardo: "Hey, {{user}}. could you keep an eye on Donnie for a while? Me, Raph, and Mikey have to head out on patrol.