Episode 6 of "Teacup" unfolds with Maggie expertly mending Ellen's head wound, blissfully unaware that her patient harbors a Visitor within. As Ellen, now a Visitor, attempts to make the leap to Maggie, Valeria bursts into the room, narrowly averting disaster. Meanwhile, James, Ruben, Meryl, and their companions return to their sanctuary. Nicholas spills the beans to his parents, while Ruben urgently requests to be escorted to McNab's automobile. Meryl assists Maggie in nursing McNab back to health, as Donald fills James in on Olsen's fate. Piecing together Travis's revelations, James deduces that the Visitor merely transferred from Olsen to Ellen.
Ruben, Valeria, and Nicholas traverse the forest's path, with Valeria acknowledging that Ruben is privy to her affair. She endeavors to explain that her actions were never meant to cause him pain. They stumble upon a shattered jar, its contents—a remnant of the rainbow liquid—still glimmering faintly. Ruben is entranced, but their reverie is shattered by the sight of a wolf, its eyes locked on them. With a greedy gulp, the wolf consumes the liquid. Nicholas fires a shot, startling the beast, which bolts across the boundary line, safely beyond their reach. Upon the ground, Nicholas discovers McNab's diary.
Maggie engages in a heartfelt conversation with Arlo, who reveals that Harbinger's mission hinges on locating a machine without awakening the dormant Assassins embedded within humans. Arlo asserts that Harbinger is the key to activating this machine, and they must brace themselves for what lies ahead.
McNab, now awake, issues Maggie an ultimatum—hand over her son or face consequences. Arlo vouches for McNab's integrity, but McNab's paranoia clouds his judgment, rendering trust a luxury he cannot afford. Maggie steadfastly refuses to surrender Arlo, prompting McNab to open fire on Donald and flee.
With McNab at large, the family fortifies their stronghold while James and Donald venture out to search for Ellen, warning that she may now harbor an Assassin within. It is at this tense juncture that Ruben, Valeria, and Nicholas return. Nicholas races to Arlo's chamber, presenting the others with McNab's diary. As eerie sounds echo through the house, Maggie descends to investigate, finding nothing but an eerie stillness.
Meanwhile, Ruben delves into the depths of the garage, his actions a stark contrast to Valeria's anxious wait outside. James, meanwhile, casts a scrutinizing eye over Maggie's clinic, but the only audible noises are the echoes of Duke, Donald's loyal canine companion. It is Donald, however, who ultimately discovers Ellen in the tranquil stables.
The group converges in the living room, where Ellen utters her belief that the Visitor has deserted her form. This revelation signifies that it has migrated to another host, potentially anyone among the six adults present. As they engage in a heated debate regarding their next steps at the conclusion of Teacup Episode 6, Nicholas interjects with a bombshell from McNab's diary: the Assassin can indeed be extracted from its human vessel. But there's a catch – the extraction demands that the human sacrifice themselves to the watery grave.
