The penultimate episode of WandaVision revealed White Vision, but the Marvel character was actually set up previously in Avengers: Infinity War. The scene occurred during the credits of WandaVision episode 8, “Previously On,” which showed acting S.W.O.R.D. director Tyler Hayward bringing Vision back online; however, this newly reanimated version has a chilling all-white appearance, rather than the familiar red and blue design used in the MCU since Vision’s live-action debut.
Vision (sometimes referred to as The Vision — particularly by Hayward) was ostensibly built in Avengers: Age of Ultron by the titular antagonist, who was attempting to create a new synthetic body for himself made of the rare metal vibranium (with the help of Helen Cho). However, Vision is actually a construct created by various parties, as Ultron himself was created by Tony Stark and Bruce Banner, who were trying to use data from the Mind Stone to create an Artificial Intelligence Peacekeeping Program. The Avengers retrieved the partially complete synthezoid from Ultron, uploaded the remains of the J.A.R.V.I.S. program to it, and then Thor used Mjolnir’s lightning to provide the power needed to give Vision life.
Vision’s dependence on the Mind Stone was a significant plot point in Avengers: Infinity War: Wanda even destroyed the stone, killing Vision in the process, in a desperate attempt to prevent Thanos from obtaining it. The movie set up the idea that Vision could live with the Mind Stone removed: as Bruce states in Infinity War, “Your mind is made of a complex construct of overlays. Jarvis, Ultron, Tony, me, the stone. All of them mixed together.” Shuri tried to reprogram Vision’s synapses so that the Infinity Stone could be removed, but was interrupted by Thanos and his army before she could complete her work. Some point after the events of Infinity War, S.W.O.R.D. retained Vision’s remains with the intent on reviving him as a sentient weapon, but were unsuccessful without the Mind Stone. WandaVision reveals that Shuri’s basic theory was right, but the SWORD scientists were missing one crucial ingredient to get Vision back online: a power source.
The surprise White Vision reveal in “Previously On” was brief and leaves many questions for the WandaVision finale to answer. The mid-credits scene showed Hayward and his team using the chaos magic from Wanda’s hex — which was still radiating throughout the drone they sent into Westview, giving the device a distinct red shimmer — to activate Vision, with Hayward commenting that it was “energy directly from the source.” Presumably, by “source” he was referring to the cosmic microwave background radiation (CMBR) that Darcy previously detected in Westview, but it could also could be a reference to the power of the Mind Stone itself — which was shown to have unlocked Wanda’s powers before the events of Age of Ultron. In other words, the scene suggests that Wanda’s chaos magic could have the same properties as the Mind Stone, or that she’s able to channel residual elements of the Mind Stone despite it having been destroyed.
WandaVision episode 8 introduces a White Vision, who is likely distinct from the version of the character Marvel fans know and love. The episode indicated through a flashback that Wanda was no longer able to sense Vision from his disassembled body, hinting that if he had been reactivated, it wouldn’t be the man she fell in love with. This new color scheme is likely a reference to the character lacking his personality and memories — either because the Mind Stone is absent, or simply as a side effect of S.W.O.R.D. reprogramming him. Whether White Vision will be an autonomous being or some sort of sentient weapon remains to be seen, but one thing is certain: the event sets up an exciting WandaVision finale.