When Jesse is caught by the cult and vanishes out of existence. He was just a teenager. More unsettling, is that it seems Samuel knew where he was the whole time.
Samuel himself. His voice is warm, calm, soothing, even. But he's a cult leader who makes people and things... vanish.
After the boiler explosion and Dan accidentally summoning him his new form includes a distorted voice and when he walks, there's a squishy sound. Dan describes him as "fleshy and dripping". Have fun picturing that.
In "Spirit Receivers", of the TV show proper, we have the horrific scene of the dodgy seance that Melody, Cassandra, Samuel and others have, using Beatris as the medium. She repeats the conversation Dan had with Melody in the scene before, only to then see something unpleasant, culiminating in her scratching her face off and gouging her eyes out...
Imagine you're Dan- you're experienced the horror of what's on the tapes, meeting Samuel, then suddenly you're kidnapped and taken to a Dark World and wake up as a cyborg. The poor guy has been through a lot.
Payphone. A "helpful" machine that can make deals with you in exchange for- your choice- psychologically painful, disgusting rituals or cutting off a body part. Worse: she is made up of all the limbs she's collected. And cannot be killed.
Season 3 finale:
Nicholas successfully finishes the ritual. But his dad shows up, tells him Christine is dead, and tells him he needs to eat his son's heart to gain his body. Nicholas is saved by Christine and murders Michael to stop him. Up till now, we knew Michael was a selfish, shady jerk but it wasn't clear just how much a monster he was.
Nicholas clearly has some trauma from killing his dad. He suddenly comes off as very cold and clinical to Dan, and at one point it seems as if he's going to give Dan's body to Static Man. He doesn't, but clearly the same Nicholas we knew isn't here.
