Christopher Chaos is a socially awkward teenager who attends Westwood High School, where his eccentric personality and overactive brain make him somewhat of an outcast. He was found alone as a baby and was taken in by his adoptive mother Annie, a nurse. One afternoon, he sees his crush, Hayden Kennedy, sneak into the woods near the school and decides to follow him, only for Hayden to transform into a werewolf and be gunned down by a group of masked figures wearing all-white. Traumatised, Christopher returns home and confesses what he saw to a pigeon, which is then hit by a garbage truck. Christopher's then builds a device which brings the bird back to life. Elsewhere in New Briar City, junior detective Jesse Tombs investigates a series of bloody murders, but is dismissed by fellow officers. She is interrupted by the Helwing Corps, who claim to have jurisdiction over the crime scene. As news of Hayden's disappearance spreads, Christopher attempts to unsuccessfully resurrect more animals, and is confronted by Hayden's best friend Jordi, a vampire who masquerades as the vigilante Dracula Boy, who believes he knows the truth. Their fight is paused when they see a member of the Helwing Corps, and Christopher states that they are responsible for killing Hayden. Micah, a low-ranked member of the Corps, meets with their leader Father Andreas, who forcibly transforms him into a vampire so that his hunters can train. During detention, Christopher, Jordi, and Hayden's girlfriend Viveka are attacked by the Corps, but are saved by a mysterious man. He teleports them away as Tombs, who had unsuccessfully questioned the group earlier, is told by her partner Rocco to turn a blind eye for her own safety. She unwittingly draws the police to the abandoned church where the group and their rescuer,
Adam Frankenstein, are hiding. Elsewhere, the Corps call on the Cardinal, one of their demonic chief enforcers, to kill Frankenstein. Adam uses a magical organ to bury the church, and takes the group to the Monster Underground, a hidden city beneath New Briar that is now abandoned after the Helwing Corps discovered it and slaughtered the inhabitants. Viveka reveals that she has been texting Hayden's phone as a way to cope with his death, unaware that it has led the Corps right to them. With the assistance of spectral cats created by Viveka's necklace, Jordi and Adam hold off the Cardinal and Helwing Corps clerics until Christopher can successfully repair the church and turn it into a weapon to kill them. Rocco tells Tombs that he and the rest of the Police work for an unseen group, and she quits in response to the corruption. Rocco is subsequently murdered by the Cardinal. Elsewhere, a member of the Undying Order chastises Father Andreas for the unsanctioned slaying of Hayden and for allowing Christopher and his friends to cause so much damage. Flashbacks detail Adam's creation by
Victor Frankenstein. After inadvertently killing his master's lover Henry, Adam flees and is taken in by a young girl named Agatha and her family, while the Helwing Corps offer their services to Victor to hunt down his creation. Six months after the battle in the Monster Underground, Christopher, Jordi, and Viveka, who have formed the Monster Club, gather at Hayden's grave where his mother Sarah chastises Jordi and blames him for her son's death. At Christopher's birthday party, the Monster Club resolve to expand their membership, while a desperate Sarah approaches her bloodthirsty former werewolf pack seeking support. The pack tasks the Volkov twins with tracking down Hayden's killer. After failing to find answers from his mother, Adam, or through research, Christopher begins electrocuting himself in order to push the limits of his body and mind so that he can find out his true origins. After being discovered by his mother, who destroys his machinery, Christopher falls into a depression. Ylvaria, pack leader and mother of Luka and Sasha Volkov, chastises them for their lack of insight, and orders them to spy on the Monster Club, whom she believes are a threat. A disgraced Father Andreas orders the Cardinal to kill Adam, disobeying the Undying Order. Viveka warily allows the Volkov twins into the Monster Club, but tensions quickly rise into a fight. Christopher stops it using an
anti-gravity ray, and suggests returning to the Monster Underground so the group can bond. Ylvaria tells Sarah that she must kill Hayden's murderer in order to re-join the pack. Cardinal follows Adam and the two prepare for a showdown. The Volkovs are awed by the Monster Underground but still quietly prepare to kill the Monster Club. Adam questions why Cardinal does the bidding of the Helwing Corps when he is also a monster, but they are interrupted by Sarah, who believes Adam is responsible for Hayden's death. The three begin to fight, and Adam convinces Sarah that Ylvaria lied to her, and she reverts to her human form but is killed by the Cardinal, who tells Adam that death always follows him. Jordi and Viveka save the Volkov twins from dying, and the group stumble upon Clement, a witch boy who lives within an enchanted mural recounting the history of his family. Clement shares his story with the group, discussing his childhood in the Underground with his grandfather, his obsessive work on chronicling his family through the mural, his love of a vampire named Damon, and his death at the hands of the Helwing Corps when he refused to evacuate in order to protect the mural. He then asks the group what they would be willing to die for. Father Andreas visits Annie and offers to help her cure Christopher of his monstrous brain with an experimental drug. Having seen Adam fighting alongside the Cardinal against Sarah, Christopher demands answers. Adam reveals that he and a group of likeminded humans and monsters, the Horrorist Society, discovered that a mysterious energy known as aether causes people to become monsters, and that be believes Christopher to be a be composed entirely of it. Christopher tells Adam that he is going to build a new world for monsters to be safe. ==Critical reception==