Monday's episode continued where episode 4 left off, with Donovan trying to hurt Stiles with that thing on the palm of his hand.
The Dread Doctors have obviously made Donovan a science project, and during his confrontation with Stiles, it was certainly a case of predator versus prey, with Stiles on the losing end.
Eventually, Stiles accidentally kills Donovan while defending himself. However, it was baffling to see Stiles react as if he committed a premeditated murder. It's a good thing the Dread Doctors know how to clean up other people's mess, and they did so for Stiles.
Stiles was surprised to see no traces of the gruesome scene when the police came, save for a drop of blood. He could have told Scott the truth, that Donovan's death was accidental and that it happened as he was defending himself, but no. Stiles lies to Scott, prompting Scott to give him the 411 on how chimeras are not the bad guys but the victims and that they should be saving them.
Meanwhile, in their efforts to know more about the "Dread Doctors" book Malia discovered last week, Scott, Stiles, Lydia and Kira decide to go back to Eichen House and talk to Dr. Valack. Incidentally, Valack wrote the "Dread Doctors" book. They found their secrets in electromagnetic forces - ways for them to prolong their lives, give them more power and, most importantly, making you forget you ever saw them."
He also blamed Scott and the gang for screwing with the Nemeton, because apparently, they reignited a supernatural force that brought the Dread Doctors back to Beacon Hills.
The episode ended with the Dread Doctors making their way to Eichen House. Thanks to Kira's kitsune powers wreaking havoc, the Dread Doctors were able to enter and suck out Valack's third eye for reasons unknown, but not before he told Lydia something profound.
Valack said if Lydia has seen the Dread Doctors or they have done something to her, the book would help her remember what happened. At that time, Lydia's suppressed memories started to come back, and all the while Valack was urging them to read the book.
It looks like the gang's fight against the Dread Doctors is just getting started.