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.

Thanos is a fictional character portrayed primarily by Josh Brolin in the Marvel Cinematic Universe (MCU) media franchise, based on the Marvel Comics supervillain of the same name. He is depicted as an alien warlord from the doomed planet Titan with a universe-spanning agenda to wipe out half of all life to stabilize overpopulation and prevent what he views as life's inevitable extinction. To do this, he sets out to obtain the six Infinity Stones, cosmic gems with the power to achieve his goal. With the help of his adopted children, Thanos fights against the Avengers, the Guardians of the Galaxy, and their allies, in the Infinity War, succeeds in assembling the Stones, and disintegrates half of all life in the universe in an event that is known as the Blip. After escaping to the Garden and destroying the Stones, he is eventually killed by Thor. Five years later, an alternate version of Thanos from 2014 time travels to 2023 to battle the Avengers once again, but is killed by Tony Stark.