Fics like Animal Instincts: Infected Humanity (Book 1)

Then he slowly turned around, and faced the horrified heroes. His bandages were bleeding through, his wrists also dripping with the red liquid, staining the floor beneath him. The heroes stumbled into a defensive stance by instinct, hearts beating frantically. Spider-Man took one step forward, and let loose another howl. But didn’t attack, he moved lightning fast onto the ceiling, and into one of the vents high up on the wall. And just like that, he was gone. ___ When S.H.I.E.L.D Academy is attacked by an unknown enemy, Spider-Man and both his teammates and fellow students, including the Avengers, inhale a mysterious toxic gas. Later, the heroes who have an genetic animal change start mutating and turn feral. S.H.I.E.L.D is forced to contain them in the abandoned S.H.I.E.L.D Academy while the search for a cure. But they discover the horrifying reality that the insane, and feral mutated heroes are getting smarter, and they want to get out. The Avengers, Nick Fury, as well as the other teen heroes are forced to team up with a group of common villains to try and beat this new threat.

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