T'Nia Miller Shares What Motion Capture for 'VisionQuest's Jocasta Was Really Like

Published Oct 26, 2026, 1:31 PM EDT She calls the experience “freeing” VisionQuest’s T’Nia Miller reveals that mo-cap for a murderous robot felt "freeing" Image: Marvel During the fourth episode of VisionQuest, titled “Malware,” the identity of the Butcherbird Killer is revealed. First mentioned in a news report Ultron (James Spader) was watching during episode 2 (“Theseus”), the Butcherbird is a serial killer who has been targeting the board members of Markridge Biotech, an AI technology company that was sold to Stark Industries in 2008, back when Stark was still developing weapons. Markridge Biotech would supply Tony Stark (Robert Downey Jr.) with the necessary technology to create his AI system J.A.R.V.I.S. and would also be used in the creation of Ultron (which, of course, would backfire). In episode 4 of VisionQuest, Vision (Paul Bettany) and the other AIs housed in his mind determine that the Butcherbird’s next victim will be Katerina Wells (Mary McDonnell), the last surviving board member of Markridge Biotech. To stop the killer, Vision, Tommy (Ruaridh Mollica), and Lisa Molinari (Lauren Morais) infiltrate a gala Wells will be speaking at, though their rescue does not go as planned. Warning: Spoilers ahead for VisionQuest episode 4 At the party, the Butcherbird Killer is revealed to be Jocasta, an AI based upon Josephine Carrington, a Markridge Biotech board member who died in 2008 due to illness, though not before uploading her consciousness into the Jocasta AI. Carrington/Jocasta is enraged that her fellow board members sold off her company to Stark, and it seems that she is now getting her revenge as Jocasta. On top of that, she seems to be collecting biokeys from her victims for some yet-to-be-revealed larger plan. Jocasta started as a robot bride to Ultron in the comics Image: Marvel Based on Jocasta Pym from Marvel Comics, Jocasta is quite a bit different from her comic book inspiration, though the changes were necessary given the Marvel Cinematic Universe’s changes to Ultron. While Ultron was created by Tony Stark and Bruce Banner in Avengers: Age of Ultron, in the original Marvel comics, Ultron was created by Hank Pym, the original Ant-Man (the one Michael Douglas plays in the movies). Soon after Pym created Ultron, Ultron turned on the Avengers, becoming one of their most formidable opponents. Pym used his own brainwaves to help create Ultron. Because of this, Ultron retained Pym’s love for Janet Van Dyne (The Wasp). Ultron eventually transferred Janet’s mind into a robot form he’d built for her, creating himself the perfect mate. Ultron even named her Jocasta after the wife/mother of the legendary King Oedipus, as Janet had helped build him, but would also become his wife. VisionQuest retains very little of Jocasta’s origins Image: Marvel All of this, of course, is wildly different from what VisionQuest is doing with Jocasta. Even the source of the name is different, as Jocasta is a portmanteau of Josephine Carrington’s first and last name — “Jo” and “ca” — and Stark (“sta”). Despite all the changes, the robot form of Jocasta looks a great deal like the comic book character. And, like the human form of Josephine Carrington, Jocasta is being played by T’Nia Miller, who also supplied the motion capture performance for Jocasta’s robotic form. It was the first time Miller had worked in motion capture and, while speaking with Polygon recently, she shared what the experience was like. “I was a bit nervous to begin with,” Miller admitted. “They put this thing on your head and all these dots on you.” After some initial hesitation, Miller said she found the experience “really freeing.” “It's almost like being in theater or at drama school,” says Miller, “You're just wearing your tracky bottoms and your T-shirt, and you can just move freely. And, because I’m playing a robot, I got to explore what that physicality looks like. We have this big room where I got to play with how she moves — where does she lead from?” Ultimately, Miller found that it allowed her a greater expression in her movement. “I think you can be bigger with it," she said. "Although it does pick up my minute movements.” We got to see the results of Miller’s experimenting during episode 4, during the fight scene between Vision and Jocasta, which included some impressive kicks and punches that quickly bested Vision. It wasn't until Vision allowed Ultron to take control of his body that the trajectory of the fight changed. Ultron tricked Jocasta into blasting Wells, disintegrating her, thus destroying the face key Jocasta needed for her plot. While this puts Ultron and Jocasta at odds, I think we can expect a romantic angle to develop between the two of them as VisionQuest progresses, because, for all of Ultron’s emotional disconnect, he does seem to be smitten with Jocasta so far.