Deep in the subterranean tunnels under Amity Park's Museum of Natural History, an ancient evil stirs. Overwhelmed by parents, school, Vlad and budding powers, Danny is left with no defense against the creeping darkness rooting into his own mind. Even as he stands as Amity's last defense, he begins to doubt his own heart... 'Nomen mihi Legio est…quia multi sumus...'

Sequel to Illegal Birthday Present. Now that Valerie has caught Danny Phantom's affair with Sam, what will she do? And Danny is going through odd changes...