Ultron makes his move in the back half of VisionQuest Episodes 3 and 4, slipping into control late in Episode 4 and changing the shape of the series just as White Vision starts to feel more alive. The turn matters because it pushes James Spader’s Ultron from a comic presence to the force driving the next chapter, with the physical world suddenly back within his grasp.
That is why Episodes 3 and 4, now streaming on Disney+, are the ones people will search for first. Paul Bettany’s White Vision begins the run as he was in the opening episodes: cold, aloof and seemingly cut off from feeling, even though he carries all the memories of the original Vision but none of his soul. By the end of Episode 3, he is coaxing Tommy on how to reboot him in the hotel swimming pool, and in Episode 4 he stops drawing such a hard line between who he was and who he is now.
Bettany gets room to play physical comedy in Episode 3 because his character’s processors are malfunctioning, which gives the performance a looseness the earlier episodes did not allow. The shift is not just mechanical. White Vision also starts to understand his emotions and the conflict inside him, and the bond between Vision and Tommy deepens as the series keeps moving him toward something closer to humanity.
Ultron, though, is still the sharpest thing in the room. Spader’s version delivers the periodic comic relief and the knowing reads on human nature that have become one of the absolute highlights of the series, but he does what Ultron always does when given the opening: he betrays his family at the first opportunity. Late in Episode 4, he manipulates his way into taking the wheel, and the story leaves him positioned not just as a voice in the mix but as a threat with actual reach.
That late handoff is the point. The series is built as a follow-up to a loose end from WandaVision, and it does not ask for anything more than that. It also handles Tommy’s bizarre existence cleanly enough that Billy’s parallel journey is not required homework, even as the show keeps adding connective tissue of its own, including a link to the first Captain America movie and possibly its real villain too. In that light, Ultron’s return feels less like a cameo than the engine of the next turn.
What makes Episode 5 worth waiting for is simple: Ultron is no longer just hovering over the story. He is back in control, and the series has already made clear that a fully empowered Ultron in the physical world is the most dangerous development it can deliver.
