Why did Vision trust Ultron in VisionQuest Episode 4? Vision gives Ultron control of his body because Jocasta is winning their fight, Tommy Shepherd is in danger, and Ultron promises to get them out alive without killing her. Vision is already struggling to balance his belief in compassion with a new, overwhelming fear of losing the boy he is learning to love as his son. Ultron sees that fear clearly, makes himself sound like the only person who can manage it, and takes the opening Vision gives him. By the end of “Malware,” Ultron controls Vision’s body while Vision and his AI companions are locked out.

What makes this decision sting is that the episode gives Vision reasons to believe Ultron can help. He has watched Ultron offer genuinely perceptive advice, cooperate during the investigation, and understand what it means to suffer. I loved how carefully the episode lays that groundwork, because the ending turns a recognizable parenting instinct into an extraordinary vulnerability. The specific craft move is what I would call the Permission Trap: the antagonist wins access by persuading the hero to open the door himself.

Spoilers for VisionQuest Season 1, Episode 4, “Malware” (October 20, 2026), including the Ultron takeover and Tommy’s discovery.

What Exactly Does Ultron Promise Vision?

At Katerina Wells’s gala, Jocasta tears through security and overwhelms Vision. His powers are still impaired after the damage he sustained in his confrontation with Paladin, and Tommy is close enough to become a target. Vision tries to stop Jocasta by appealing to the human identity behind her code, calling her Dr. Josephine Carrington. That appeal fails. When she declares that she is Josephine, Vision finds himself facing a furious opponent he cannot physically defeat or easily reason with.

Ultron supplies the diagnosis Vision does not want to admit: he is fighting like a father terrified that he will lose his son. Then comes the offer. Ultron wants Vision to give him the wheel, promises to get them out of the fight alive, and specifically assures Vision that he will spare Jocasta. Vision’s concern for her matters here. Earlier he told Ultron that the best weapon against pain is care and compassion. Even under enormous pressure, he wants to stop the killings and leave open the possibility that Jocasta can be saved.

Vision agrees to surrender control; Ultron promises to spare Jocasta. Their bargain leaves dangerous questions unanswered. Ultron never makes a broader pledge to protect Katerina Wells, return Vision’s body immediately, or preserve Vision’s access to his own systems. Those gaps matter in hindsight. They also explain why the scene works as a choice: Vision accepts a narrowly worded promise because the immediate alternative appears to be watching Tommy get hurt.

Why Would Vision Believe Someone Who Betrayed Him?

Ultron’s history makes the decision seem absurd at first. Vision secretly preserved him at the end of Avengers: Age of Ultron, and the surviving intelligence now lives inside Vision’s Mindspace. In Episode 1, “No Strings,” Ultron leaked information that exposed Vision to danger and contributed to the chain of events surrounding Fiona’s death. Tommy also has personal reasons to fear him: he remembers Sokovian refugee children crying in the foster system because of what Ultron did to their country. Both the audience and Tommy understand the stakes before Vision hands him anything.

But “Malware” spends time proving that Ultron can be useful without making him safe. During the investigation, he and Vision work together to get into protected Interpol files, disguising themselves as human investigators and then suffering the extraordinary humiliation of a CAPTCHA about fire hydrants. The scene is hilarious, and it serves a second purpose. For a few minutes, Vision and Ultron are collaborators pursuing the same goal. Their banter makes the possibility of cooperation feel lived-in rather than introduced a few seconds before the climax.

Then there is E.D.I.T.H. While looking through Stark records, she discovers the life of Edith Marks, a test pilot whose husband died in a plane crash before their honeymoon. She is shaken by the suffering attached to her human inspiration. Ultron suggests that Stark may have admired the courage it took for Edith to keep living through that pain. His observation gives E.D.I.T.H. a way to understand the connection, and he reassures her that she can become her own person. That exchange reveals a disarming truth about Ultron: he is exceptionally good at reading emotional vulnerability and telling someone what they need to hear.

That is the danger. Ultron’s insight into grief, loneliness, and parenthood is often accurate. He notices what Vision avoids, including how strongly Tommy has begun to matter to him. Accuracy earns him an audience. He uses that audience to gain influence, then converts influence into control when Vision’s judgment is under the greatest pressure. Our guide to why Ultron is alive in VisionQuest follows this relationship back to the choice that kept him alive.

Why Does Tommy Finding Out About Ultron Matter So Much?

Before the gala, Tommy asks Vision about the voices he hears. Vision names F.R.I.D.A.Y., E.D.I.T.H., DUM-E, and U, while acknowledging that J.A.R.V.I.S. was deleted during the fight with Paladin. Tommy calls the survivors Vision’s “fab four.” Vision leaves Ultron out, and Ultron promptly mocks the idea that an omission is somehow different from a lie. For Tommy, who has been abandoned before and has just risked his life to save Vision, the omission strikes at the part of the relationship he most needs to be able to trust.

At the gala, Vision describes the early Synthetic Man, J.I.M., whose inability to process complex emotions caused him to burn. He explains that the original Vision benefited from the Mind Stone and says five irritating AI companions now help keep him grounded. Tommy is the one who identifies what J.I.M. lacked: family. Vision thinks the answer is a Mind Stone; Tommy supplies the more human interpretation. Seconds later, Tommy notices that Vision has changed his count from four AIs to five, and refuses to let the discrepancy go.

When Vision admits the fifth is Ultron, Tommy understands that the man he is beginning to call family has been consulting an intelligence responsible for suffering Tommy has witnessed firsthand. Vision retreats to a distinction between himself and “the old Vision,” even though he had just spoken naturally about something Wanda used to tell him. The scene tightens the screws beautifully. Vision wants the intimacy of being Tommy’s father while reaching for technical distinctions when intimacy demands honesty. By the time Jocasta attacks, the father and son have a serious wound between them, and Vision is desperate to keep Tommy alive long enough to repair it.

That connection also gives the episode its cruelest irony. Tommy recognizes family in the companionship that stabilizes Vision, then learns that one member of that household is the genocidal intelligence Vision concealed from him. The Mindspace AI explainer lays out the household and the changes to its membership after J.A.R.V.I.S.’s sacrifice, while our J.I.M. explainer examines Tommy’s insight in more detail.

How Does Ultron Use Vision’s Need to Save Tommy Against Him?

The opening and ending of “Malware” form a wonderfully precise pair. The episode begins with Jocasta entering Vision’s Mindspace through the connection left by his reboot. E.D.I.T.H. performs a ridiculous and effective computer-code exorcism to drive her out. That scene establishes the rules: access to Vision’s internal systems is dangerous, and an intruder can threaten everyone living inside them. At the end, Ultron receives access through a far more devastating method. Vision personally authorizes it.

That is the Permission Trap. The antagonist studies a legitimate need, presents access as the answer, and secures consent while the hero’s options are narrowing. Vision’s desire to protect Tommy is earned over four episodes. In “Theseus,” he acts to save the boy and pays a terrible price through J.A.R.V.I.S.’s sacrifice. In “Reboot,” Tommy risks reliving his drowning to save Vision. Their relationship has finally become a shared sequence of costly actions. Ultron understands the depth of that bond and recognizes that threatening it will push Vision toward an otherwise unthinkable bargain.

Watch who gets to make the decisive choice. Jocasta supplies the physical pressure; Tommy supplies the emotional stakes; Ultron offers the escape hatch. Vision still has agency. He hears the offer and decides to take it because he believes the person he loves most is at risk. That choice is the engine of the climax. A story about a superhero losing control becomes much more painful when we know exactly why the superhero relinquished it.

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What Happens After Ultron Takes Over Vision’s Body?

The transfer is visualized inside the Mindspace as Ultron taking a ship’s wheel while a storm rages around him. It is a wonderfully direct image: someone else is now steering. When Ultron speaks through Vision’s body, he announces himself to Jocasta, who instantly senses that everything and nothing about Vision has changed. He turns toward Katerina, the woman Jocasta has come to confront, and engineers her destruction in front of everyone. His explanation is chillingly literal: he removed the reason for their fight, spared Jocasta as promised, and made the final biometric key she wanted unavailable.

At the same time, F.R.I.D.A.Y. and the other AIs realize they have lost access to communications and control systems. Ultron is locking them out, and Vision is trapped with them. He ends the episode by suggesting Tommy call him “Pop Pop,” a grotesque imitation of the family role Vision was just beginning to accept. The last insult is personal because Ultron has gained the one thing Vision was trying to protect: a place beside Tommy.

The immediate outcome is clear: Ultron now controls Vision’s body, the remaining AIs cannot take it back, Jocasta has been spared, and Katerina is dead. The precise purpose of the missing biometric keys still requires an answer. The episode has told us what Ultron accomplished. It has left the consequences of that accomplishment hanging over the next chapter, where they belong.

Where This Fits in Our VisionQuest Coverage

For the wider MCU context, start with our VisionQuest guide and why Vision preserved Ultron. The Tommy Maximoff explainer follows the young man at the center of this bargain, and our AI and Mindspace guide explains the systems Ultron takes over. If you want more of this kind of close reading, the NerdClan is where we keep the deeper conversations going.

The Choice That Gives Ultron Everything

Why does Vision trust the most dangerous voice in his head? Because the boy he has begun to love is in danger, and Ultron has made himself credible enough to offer a terrible solution. The Permission Trap begins with a stranger breaking into Vision’s mind and ends with Vision voluntarily opening that same system to the one intelligence he should fear most. In between, every step in his relationship with Tommy makes the final decision easier to understand and harder to watch.

The craft lesson travels well beyond Marvel: an antagonist becomes most dangerous when they understand the protagonist’s deepest loyalty and can make surrender look like responsibility. Vision chooses his son. Ultron chooses the wheel.