In a flashback, Parrish tells Lydia about a dream where he carries a body to the Nemeton before setting himself on fire. In the present, the Doctors abduct Donovan and transform him into a supernatural creature, and Theo is revealed to be working with the Doctors. Lydia undergoes surgery in the hospital. Deaton informs Scott that Belasko was a werewolf-Garuda hybrid, while Tracy was a werewolf-Kanima hybrid. They were both created artificially, explaining why Tracy was immune to mountain ash: someone is creating hybrid supernatural creatures, which Scott dubs Chimeras. Liam agrees to be Mason's wingman at a nightclub. While there, Liam argues with a girl named Hayden, while another Chimera, Lucas, tries to seduce Mason. Scott, Kira, Liam, and Brett manage to subdue Lucas, who is revealed to be a werewolf-scorpion hybrid. Kira loses control and attempts to kill Lucas, but Scott stops her. The Doctors appear and kill Lucas themselves, stating that he was a failure. Malia discovers a book in Tracy's bedroom called "The Dread Doctors,” featuring pictures of the Doctors on its cover. Parrish takes Lucas's body to the Nemeton in a trance and sets them both ablaze. Elsewhere, Stiles is attacked by Donovan, who has been fully transformed into a Chimera.
This episode marks the first time that the new creatures are referred to as "Chimeras" after Scott uses the name due to its definition, "a creature with incongruous parts." He got the idea in AP Biology class, where they talked about genetic chimerism.
Lucas is the third Chimera to be killed by the Dread Doctors after being referred to as a "failure," also after Belasko and Tracy.
Theo Raeken is revealed to indeed be working with the Dread Doctors when he's seen encouraging Donovan to get back at Sheriff Stilinski by "going after someone he loves"-- Stiles. The reasoning for this remains unknown, but this decision will play a role in the rest of the season.
It is possible that Theo did this to encourage Stiles' darker nature by forcing him to kill Donovan in self-defense.
Several new characters are introduced in this episode:
Lucas, a gay teenager who was turned into a Werewolf/Scorpion Chimera by the Dread Doctors, which caused him to extend and retract venom-secreting stingers from his skin.
Corey, another gay teenager who was in a relationship with Lucas and who was stung by him, forcing him to be rushed to the emergency room in agonizing pain until Scott was able to absorb his pain and help him.
Kira's new Kitsune aura is revealed for the second time when she suddenly tried to kill Lucas, continuing to suggest that something is wrong with her. The first time her aura was seen was in Dreamcatchers.
Kira shouts, "Watashi wa shi no shisha da!" when she attempts to kill Lucas, which means "I am the Messenger of Death!" This is the first time she has been shown to speak Japanese in the series.
Belasko's talons were first suggested to be that of a harpy eagle by Deaton in Parasomnia.
In addition, Deaton confirms that Tracy Stewart was able to cross the mountain ash barrier in the animal clinic because she and the other Chimeras are not technically supernatural-- they were simply given supernatural powers through pseudoscientific means. The fact that Chimeras are immune to mountain ash was first implied in Dreamcatchers.
He also confirms that the fact that the Chimeras were buried in the woods means it must be part of their incubation process, which was first implied in Dreamcatchers.
Lydia references Deputy Haigh dousing Jordan Parrish in gasoline before setting him on fire during the Deadpool, which helped them realize that he is indeed a supernatural creature with a fire immunity. This assassination attempt occurred in Perishable.
It is also revealed that part of Parrish's yet-unknown supernatural identity involves taking the bodies of dead Chimeras and supernaturals to the Nemeton, though the rest of the characters will not figure this out until Ouroboros.
This episode marks the beginning of Sheriff Stilinski's discomfort and frustration with regards to covering up supernatural crimes by breaking the law, which will play a role in the rest of Season 5A.
This episode introduces a new nightclub called Sinema where Hayden Romero works as a waitress; it gets its name from the fact that it plays old horror movies on a projector against a blank wall. This is an mixed club that welcomes both straight and LGBTQ+ customers and seems to be replacing Jungle, the nightclub from Season 2, which also featured go-go dancers.
Scott tells Kira that he loves her for the first time since they officially began their romantic relationship in Season 4's Muted. However, it was an off-hand remark, and the sentiment will not be returned by Kira until Codominance.
Malia finds a book in Tracy Stewart's bedroom called The Dread Doctors by T.R. McCammon, which the Chimera read before her death. This book will be very important throughout Season 5A.
Despite Natalie Martin's terrifying introduction to the supernatural world of Beacon Hills in Dreamcatchers and the beginning of this episode, she appears to still be in denial about the supernatural and what happened to her.
Malia erases "Who is the Desert Wolf?" from Stiles' crime board. Kira and Scott make out in the McCall House living room until they're interrupted by Deaton's arrival.
"Lookin' At You" by SpeakerHedz
Liam and Mason arrive at Sinema, though Mason has to bribe Hayden with $50 to allow them entry.
"Orion" by DallasK
Liam and Mason walk through the club and see Brett dancing passionately, first with a young woman and then with a young man.
"Vice" by DallasK
Malia tries to awaken Stiles at the library and leaves to go to the Stewart House. Phil drinks Hayden's body shots despite her insistence that the money for them comes out of her paycheck.
"Area51" by Hardball & DallasK
Liam admits to Brett that he has a bad feeling about someone in the club. Mason catches Lucas' eye from across the room.
"Superfuture" by DallasK
Liam accidentally bumps into Hayden and spills her tray of body shots. She complains that they cost $10 a piece and will come out of her paycheck, and Liam gives her the $12 and change he has in his pocket before she angrily informs him that he owes her $200.
"America" by No Ego
Mason and Lucas kiss in a secluded corner of the club and discuss Night of the Living Dead.
"Alienz" by DallasK
Mason and Lucas' makeout session is interrupted by Brett, who has partially wolfed-out at the sight of the scorpion stingers protruding from Lucas' back and arms and tells him to run while they fight.
"God Loves War" by Black Sugar Transmission
Scott and Kira walk into the club to search for Lucas.