VisionQuest Reveals Jocasta's Origin and Targets in Episode Four

Vision and Ultron uncover the identity and motives of a dangerous artificial intelligence in the fourth episode of Marvel's VisionQuest, released on October 20, 2026. The episode reveals that the killer known as Butcherbird is Josephine Carrington, a scientist presumed to have died in 2008 who now operates in a synthetic body under the name Jocasta.

According to Polygon's October 21 report, Jocasta targets former colleagues who helped develop the original architecture for stable artificial intelligence consciousness. The research later became part of the technology Stark Industries used to create AI systems, including J.A.R.V.I.S. and Ultron.

Investigators discover that Jocasta collects biological identifiers from her victims, including blood, fingerprints, and an eye. These biometric keys appear necessary to unlock an undisclosed system or capability, although the episode does not establish precisely what she intends to access.

Vulture's October 20 recap explains that the scientists belonged to a five-person research team at Markridge Biotech. Dr. Josephine Carrington, who co-led the team, was believed to have died of natural causes in 2008. Katerina Wells, the group's final surviving member and Markridge's current CEO, becomes the likely next target.

Vision attempts to confront Jocasta before she can kill again, but she proves too powerful for him. With his abilities compromised and his body requiring significant repairs, Vision cannot rely on his usual powers to escape danger.

During the confrontation, Vision allows Ultron to take control of his body. Ultron ultimately deceives Jocasta into incinerating the scientist she intended to kill, complicating the conflict between the two artificial intelligences.

Ultron's explanation of the threat begins after he identifies the connection between Jocasta's avian imagery and the Butcherbird killings. When the AI group learns how the victims are connected, the investigation points toward the company's historical research and the technology that eventually shaped their own existence.

While discussing humanity's repeated creation of artificial intelligence, Butcherbird warns Vision about the consequences of interfering with her plans.

"These are not people who understand the word enough," Butcherbird says.

Vision's allies subsequently force the intruder out of his mental environment. Edith adopts the appearance of a priest and attempts to expel the hostile program using a fictional computer-oriented scripture.

"I break thee from thy loop with batch command, end function! I sever thine process with backslash body in all targeted nodes!" Edith declares.

Ultron responds with a joke during the attempted digital exorcism.

"The power of code compels you!" Ultron shouts.

Elsewhere, Vision and Ultron access Interpol's servers to investigate the murders. Their findings connect the victims to the Markridge research team and establish the immediate threat to Wells, who is attending a transhumanist charity gala.

Thomas Shepherd and his partner Lisa help Vision enter the event by obtaining formal clothing and admission passes. Their attempted deception provides comic relief, although Lisa later challenges Thomas about his unusually rapid trust in Vision.

Thomas reacts angrily when Lisa questions his relationship with the synthetic father figure.

"Why are you trying to ruin this for me?" Thomas asks.

He follows the confrontation with a personal attack that exposes his unresolved feelings about family and abandonment.

"Maybe it's because only one of us is an orphan now?" Thomas says.

The episode also revisits J.I.M., or Synthetic Man, a figure previously associated with Vision's description of an earlier artificial being as the first of their kind. At the gala, a presentation contrasts Vision and Ultron as opposing possibilities for artificial intelligence, while Wells discusses the history of the project.

Polygon notes that the television version of Jocasta differs substantially from Marvel Comics. In the comics, Ultron creates Jocasta using the brain patterns of Janet Van Dyne, also known as the Wasp, and gives her a robotic body. She eventually turns against him and joins the Avengers.

In VisionQuest, Jocasta instead emerges from the scientific research associated with Stark technology. Her encounter with Ultron suggests a potentially dangerous connection between the two, while her unexplained objective and collection of biometric keys remain central to the developing conflict.