The Blip
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The Blip is a major fictional event and period of time depicted in the Marvel Cinematic Universe. The Blip began in 2018 when Thanos, wielding all six Infinity Stones in the Infinity Gauntlet, exterminated half of all living things in the universe, chosen at random, with the snap of his fingers. The Blip ended five years later, in 2023, when the Avengers utilized time travel to collect the Infinity Stones from prior points in the timeline and, with a second snap by Avengers member Bruce Banner, restored all those previously killed by Thanos.
Doctor Strange dusting after Thanos acquired all six Infinity Stones and snapped his fingers
The Snap as depicted in The Infinity Gauntlet series
Infinity Stones
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The Infinity Stones are fictional items in the Marvel Cinematic Universe (MCU) media franchise, based on the Infinity Gems of the Marvel Comics. As expounded across several interwoven MCU multimedia titles, the six Infinity Stones are reputed to embody and control essential aspects of existence—Space, Mind, Reality, Power, Time and Soul—thereby making them critical artifacts in the MCU and, together, the MacGuffin of the dedicated Infinity Saga.
Ultron in What If...? stores the Stones in his armor as opposed to using the Infinity Gauntlet.
A model of the Infinity Gauntlet at the 2018 Atlanta Comic-Con
James Gunn came up with the backstory of the Stones while writing the script for Guardians of the Galaxy.