WARNING: The following article contains major spoilers for Avengers: Infinity War, in theaters now.
The Vision is dead! Long live the Vision! In Avengers: Infinity War, the android met his untimely end twice: once at the mercy of his partner Scarlet Witch, who used her powers to destroy the Mind Stone, and the other at Thanos' hand after he turned back time to reverse the Infinity Stone's destruction. However, judging by his final moments on screen, Vision may not be gone for good.
At the climax of the film, Thanos tore through the Avengers, waving fan-favorite characters away like gnats. As he approached, Vision begged Scarlet Witch to destroy the Mind Stone in his head. She obliged, and the Mind Stone shattered just before Thanos reached them. The ensuing explosion completely obliterated Vision, leaving nothing but a smoking crater behind.
However, unbeknownst to the Avengers, Thanos had already acquired the Time Stone from Doctor Strange. That meant the Mad Titan could reverse time with a flick of the wrist -- which was exactly what he did. He rewound time to the moment just before the Time Stone exploded, thus restoring Vision. Thanos then grabbed Vision by the throat and tore the Mind Stone out of his head, killing him again.
This is where things get interesting. As soon as he died, the color disappeared from his costume. The purple faded to gray; the green, to white. A closeup look at his face revealed that his eyes had also turned completely white in death. This color change is particularly important, since Vision once turned white in the comics -- right after he was brought back from the dead by Hank Pym.
In 1989's West Coast Avengers #42, Vision was kidnapped by an network of international spy agencies that feared he would use his powers to take over the world. By the time the West Coast Avengers tracked him down, they were too late; Vision had already been completely disassembled. The Vision as they knew him was, for all intents and purposes, dead.
Fortunately, Hank Pym was able to put him back together, but the "new" Vision had some noticeable differences. For one, he had completely changed colors, becoming a "ghost" of his old self. The other change was a bit more subtle, and far more devastating for his friends and family, particularly his wife Scarlet Witch. Though Pym downloaded Avengers data files to replace Vision's memories, Vision lacked all the emotion of his previous incarnation.
Effectively, Vision had lost his soul.