The Legion of Chaos

Percy, Jason and Nico join the Legion of Chaos and meet characters from Harry Potter, Hunger Games, Kane Chronicles, Divergent, HIVE, Gallagher, Heist society, Disney, Skullduggery Pleasant, Sherlock, Merlin, and Dr Who (11th Dr). Tartarus starts to rise on earth so Chaos sends his best Alphas to help the Avengers (and Spiderman) to try and stop him. Spoilers for like, everything.