Time Travel

Time travel is the concept of traveling either backwards or forwards in time from the present date. The time is immutable, meaning that the past cannot be changed and that any attempt to do so will result in alternate timelines/realities.

Time Stone
"The Infinity Stones create what you experience as the flow of time. Remove one of the stones, and that flow splits. Now, this may benefit your reality, but my new one, not so much. In this new branch reality, without our chief weapon against the forces of darkness, our world will be overrun, millions would suffer."

- Ancient One To be added

Victor Stein's Time Machine
To be added

White Monolith
To be added

Quantum Realm
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Time Travel Types
To be added

Destruction of Earth
"You probably never heard of it, but in quantum physics, there's a theory that, for every universe, there are infinite parallel universes. So in my universe, you destroyed the planet."

- Deke Shaw to Quake Approximately ninety years after the destruction of planet Earth, Deke Shaw claimed that Quake was the one who caused it. When she replied that she was not strong enough to cause such a disaster, Shaw explained a quantum physics theory that for every universe there are infinite parallel universes, implying that she came from the past into the future of an alternate universe and not her own. When the S.H.I.E.L.D. team returned to the past they prevented the destruction of Earth, altering the original chain of events and creating a different timeline.

Time Heist
When the Avengers utilized the properties of the Quantum Realm, following Ant-Man's advice, and created the Quantum Tunnel that allowed them to collect the Infinity Stones years before Thanos and the Decimation, they initiated a Time Heist, which involved them traveling to the past and amassing all six Infinity Stones. Hulk, Ant-Man, Iron Man and Captain America were sent back to the Battle of New York in 2012, where Hulk was sent to the New York Sanctum to request the Time Stone. The Ancient One refused, however, explaining that she could not give him the Infinity Stone so Banner could alter his timeline and subsequently leave hers undefended without the stone, although Hulk promised that he would return the stone to her at the exact moment it was taken. After the Battle of Earth, Captain America returns the stones to their proper place in time before their eventual destruction, averting the creation of an alternative timeline or a splinter reality from continue existing.

Loki's Sudden Escape
However, despite the Avengers' success to return the Infinity Stones into their proper timeline, Iron Man and Ant-Man's failure to obtain the Space Stone that was still contained by the Tesseract, leading to the creation of a new alternative timeline, since the Loki from that timeline was able to get his hands on the cube during an accident at the Avengers Tower, creating a wormhole and successfully escaping his fate of being confined on Asgard, taking moments after his defeat in the end of the Battle of New York. As a result, this past alternative version of Loki has ultimately avoided his fate in the future, getting killed at the hands of his master, Thanos.

Thanos' Disappearance
During the Time Heist, an alternate version of Thanos from 2014 became aware of the Avengers' plan and hijacked the Quantum Tunnel, traveling to 2023 to stop them. In doing so, this created an alternate timeline where Thanos and his forces disappeared from existence in 2014. This means that Thanos never begins his campaign to collect the Infinity Stones and cause the Decimation, thus sparring countless lives, including the ones who would have been claimed prior to the snap. This most likely also prevented the formation of the Guardians of the Galaxy, seeing as how Thanos is no longer around to instruct Ronan the Accuser to retrieve the Power Stone, thus there would not be a common enemy for the Guardians to band together against.

Steve Rogers' Choice
After successfully returning the Infinity Stones back into their proper timeline, Steve Rogers followed Stark's advice to him to get a normal life which Tony Stark had suggested before his death, choosing to travel back to 1940s in order to live out the rest of his life with Peggy Carter, instead of returning to 2023 as planned, thus creating an alternate timeline. Finally reunited with Carter, he finally gives her the dance he promised her, and the two eventually get married. After his marriage, Rogers retired from his "Captain America" moniker, but would continue to help out when he was needed in his new timeline. Having grown old from his retirement, Rogers eventually visits Sam Wilson back in 2023, entrusting him with his shield and choosing him as his successor.

Time Travelers

 * Phil Coulson
 * Melinda May
 * Jemma Simmons
 * Daisy Johnson/Quake
 * Alphonso Mackenzie
 * Yo-Yo Rodriguez
 * Leo Fitz
 * Deke Shaw
 * Scott Lang/Ant-Man
 * Clint Barton/Hawkeye
 * Steve Rogers/Captain America
 * Tony Stark/Iron Man †
 * Bruce Banner/Hulk
 * Natasha Romanoff/Black Widow †
 * James Rhodes/War Machine
 * Nebula
 * Rocket Raccoon
 * Thor
 * Nebula † (alternate timeline)
 * Gamora (alternate timeline)
 * Proxima Midnight † (alternate timeline)
 * Corvus Glaive † (alternate timeline)
 * Cull Obsidian † (alternate timeline)
 * Ebony Maw † (alternate timeline)
 * Thanos † (alternate timeline)