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The Time Stone grants its owner the power to re-wind or fast-forward time. Stephen Strange (Benedict Cumberbatch) discovers it in the Eye of Agomoto pendant in the library of Kamar-Taj, where he trains in the mystic arts in Doctor Strange. He uses the stone at the end of the film to trap the villain Dormammu in a time loop so that Dormammu can’t destroy the Earth.
Wisely, Doctor Strange doesn’t hand over the stone to a sketchy junk collector or a hapless policeman and decides to watch over it himself. He returns the Stone to Kamar-Taj, where he currently resides, at the end of the movie.
Doctor Strange wears the Time Stone throughout Infinity War and even tells Iron Man that if he has to choose between giving up the stone and saving the lives of the Avengers, he’ll prioritize the stone. Later, he uses the power of the Time Stone to look into the many possible futures at the end of the Infinity War. He gleans that he will have to give up the stone to Thanos in order for the Avengers to eventually defeat the Mad Titan. He does so and disintegrates when Thanos snaps his fingers.
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The Soul Stone
In Infinity War, Thanos travels with Gamora to the planet Vormir, where the Soul Stone is kept. There they encounter Red Skull, the villain from the first Captain America movie, who has been doomed to guard but not use the Soul Stone after trying to handle the Space Stone himself. Red Skull tells Thanos that he needs to sacrifice something he loves to attain the gem, and Thanos kills Gamora.
It’s unclear what the Soul Stone’s powers are in the film universe. In the comics, the gem allows the holder to capture and control others’ souls. It also creates a separate universe where the person who wields it can trip souls. It’s possible that the people who turned to dust at the end of Infinity War may simply reside in this alternate universe created by the stone.