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Earth-811 is the designated future timeline where the Sentinels rule North America. Most mutants have been hunted down and exterminated, and those that survive are kept in concentration camps. This is the home reality of Rachel Summers and Nimrod.
According to Rachel Summers, the earliest known point of divergence between Earth-811 and Earth-616 took place after Jean Grey had been possessed by the Dark Phoenix. She returned to the home of her parents, and driven by Dark Phoenix's rage she demonstrated her powers in front of them. In Earth-616, this led her father to disown her and cast her out. However, in Earth-811 her father realized that, as a telepath, Jean could feel the subconscious fear that her parents and sister felt in her presence. Realizing that this was causing her pain that she could not block out, he chose not to cast her out. As a result, Jean Grey did not die in the Shi'ar duel of honor (as she had in Earth-616). She married Scott Summers and had a single child, whom they named Rachel and who inherited Jean's psychic powers.
A second point of divergence occurred on Halloween 1980. In Earth-811, on this date, Senator Robert Kelly, Charles Xavier and Moira MacTaggert were attacked and killed by the Brotherhood of Evil Mutants in Washington, D.C. (In Earth-616, this attack was prevented by a time-traveling Kate Pryde from the Earth-811 timeline, see Days of Future Past below.) 
The death of Senator Kelly made mutants the objects of fear and hatred among baseline humans. At around this time, there were violent anti-mutant riots. In one such riot, John and Elaine Grey, Jean Grey's parents, were killed. In 1984, a "rabid anti-mutant candidate" was elected President of the United States. Within a year, the first Mutant Control Act was passed, although the Supreme Court had it struck down as unconstitutional. Nevertheless, a second Mutant Control Act was passed in 1988 and upheld.
The US administration reactivated the Sentinels, programming them to eliminate the mutant threat once and for all. The robots concluded that the best way to accomplish this would be to take over the whole country. During the takeover, they killed not only mutants, but other beings with super powers, including the Avengers and the Fantastic Four. Survivors were sent to concentration camps. By the year 2000, Sentinels ruled the entire North American continent. The rest of the world became more frightened of the Sentinels than of mutants, and threatened war if the Sentinels ever moved outside of North America. The Sentinels operated out of their main headquarters in the Baxter Building, New York City.
By the year 2013, people were in one of three classes and marked with a certain letter:
- Baseline humans (H) have no mutant genes, and are permitted to breed;
- Anomalous humans (A) are not mutants themselves, but possess mutant genetic potential, and are forbidden to breed; and
- Mutants (M) who are forced to live in concentration camps and serve the Sentinels, and are shunned and hated by other humans.
At this time, the only surviving X-Men were Kate Pryde, Storm, Colossus, and Wolverine. Wolverine had managed to escape Sentinel capture and became a Colonel in the Canadian Resistance Army, although the other three had been captured and lived at the South Bronx Mutant Internment Center, where they formed another Anti-Sentinel resistance along with Franklin Richards, Rachel Summers and a paraplegic Magneto.
Days of Future Past
In 2013, the Anti-Sentinel Resistance discovered that the Sentinels, driven by their prime directive, were planning to move out of North America and invade other countries. Knowing that this would automatically trigger a full-scale nuclear strike from the other great powers, and thus destroy the world in a nuclear holocaust, they made a plan to change history and prevent the Sentinels from taking power. In particular, it was Rachel Summers who worked out the plan to use her telepathic powers to send the consciousness of one member of the resistance back to Halloween 1980, to swap bodies with their younger self and prevent the assassination of Senator Kelly. Kate Pryde was chosen, since in 1980 her younger self (Kitty Pryde, aka Sprite) had only recently joined the X-Men and had not yet been trained to defend herself from psychic attack.
With Logan's help, they constructed a "jammer" to disrupt the effectiveness of their control collars, allowing Rachel to send Kate's consciousness back in time to 1980 in Earth-616 (although it was later revealed by Rachel Summers and, independently, by Nimrod that Earth-616 was not in fact the past of Earth-811 and that Kate had "moved cross-time as well as down"), and allowing the resistance members to remove the collars permanently and regain the use of their powers. Logan then helped them escape from the internment center, leaving Magneto behind to cover their escape. They were tracked down by Sentinels, and though they managed to defeat the Sentinels with their powers, Franklin Richards was slain. Leaving Rachel alone to protect Kate's body (and the consciousness of the younger Kitty Pryde), Logan, Ororo and Peter attempted to launch an attack on the Sentinels' headquarters in the Baxter Building, only to be swiftly and mercilessly killed
Back in 1980, Kate Pryde warned the X-Men of Senator Kelly's assassination and the bleak future it would cause. They traveled to Washington, where Kate successfully prevented the assassination before switching places again with the young Kitty Pryde, returning to her own reality.
Of course, preventing Kelly's assassination did not erase this possible future; it only created a new future. Pryde and Summers tried again. Summers traveled back in time. Nimrod, an advanced Sentinel, killed Pryde and followed. Summers visited Professor Xavier's school but quickly left (it had been destroyed by the army in her future, leaving her the only survivor). She joined the X-Men for a time and then became a founder of Excalibur.
A related event, Days of Future Present, took place in the present but involved the Franklin Richards who apparently died in the first story. It also involved a new character, Ahab, who was Master of the Hounds in the future and had made Rachel one of his Hounds.
Another story, actually a prequel, appeared in a limited series, Wolverine: Days of Future Past (December 1997 - February 1998). This story explained, among other things, how Magneto wound up a paraplegic in the first story.
Unbeknown to the present-day Excalibur, Kate Pryde had become lost in time and merged with Widget, their robot. When a team from Camelot found her in their time, she brought Excalibur (including Shadowcat, her younger self) forward in time. The Sentinels overran Camelot, leaving few survivors. After removing the machinery inside a defeated Sentinel, Excalibur and the others used it to infiltrate the Hive and reprogram the Hierarchy, the master controller of all Sentinels. Instead of protecting only "pure" humans, they would now protect all life.
One last story has a similar title but definitely takes place in another reality (Earth-2992). In this story, "Days of Future Tense", the survivors of Excalibur were wiped out by Black Air, a British intelligence agency collaborating with the Sentinels.
Days of Future Past in Other Media
The children's television series adapted this event but combined it with elements of Age of Apocalypse and Bishop's future. In "Days of Future Past" (also known as "Future Tense," episodes 11-12), Bishop is a bounty hunter in the year 2050, at first working with the Sentinels but then with the mutant underground. Forge sends him back in time to prevent Kelly's assassination and unmask Gambit as a traitor. Nimrod follows Bishop into the past. Gambit saves Kelly from Mystique, who has disguised herself as Gambit. Before Bishop can kill both Gambits, Rogue removes his temporal transceiver, which sends him back to the future.
In "Time Fugitives" (episodes 20-21) the future Bishop learns that Apocalypse created a mutant plague. He goes back in time again to destroy the plague before it can infect a mutant and become infinitely more dangerous. He does so, but Apocalypse kills all the X-Men, which prevents the existence of Cable in 3999. Cable appears, prevents the plague's first destruction, and instead uses Wolverine's healing factor to destroy it again.
In "Beyond Good and Evil" (episodes 53-56) Bishop time travels yet again to prevent the Age of Apocalypse. On the trip home, he collides with Apocalypse, who has stolen Cable's time machine, and both go to the Axis of Time. Here, with the power to affect any and all times, Apocalypse tries to rewrite history. With the help of the Time Janitor (actually Immortus), Bishop frees some of Apocalypse's captive mutants, who cast Apocalypse out of the Axis.
- In the Danger Room sequence that opens X-Men: The Last Stand, the X-Men fight a Sentinel in a ruined city. It may or may not be a reference to Days of Future Past.
- The plot of Days of Future Past will be adapted for film in the upcoming film X-Men: Days of Future Past.
The animated television series Wolverine and the X-Men has Professor Xavier in a coma and waking up to find future very much like Days of the Future Past. The entire first season of the show is dedicated to Xavier communicating with the X-Men in the past, particularly Wolverine, in attempting to stop this future from happening. In the end it is stopped but with an Age of Apocalypse type world taking its place at the final episode of season one.
Marvel Super Heroes Role-Playing Game
The Days of Future Past storyline was also the basis for a four-issue game module series for TSR's Marvel Super Heroes role-playing game (FASERIP version), with the titles Nightmares of Futures Past (1986), The X-Potential, Reap the Whirlwind, and Flames of Doom (all in 1987), all of them set in the alternate Earth-811.
- Earth-811 is the designated future timeline depicted in the X-Men story arc called "Days of Future Past", first published in 1981. Although the bleak future from "Days of Future Past" has reappeared in several stories since, it is possible that not all of these stories take place in Earth-811, although they have been mentioned here because of their similarities.
- In 2001 the first chapter of Days of Future Past (X-Men #141) was named #25 on the list of greatest Marvel comics.
- Characters from Earth-811
- Other things related to Earth-811
- Earth-811's Appearances
- Images from Earth-811
- Reality Gallery: Earth-811
- ↑ 1.0 1.1 1.2 1.3 The Uncanny X-Men #141, "Days of Future Past" (January 1981)
- ↑ The Uncanny X-Men #136, "Child of Light and Darkness!" (August 1980)
- ↑ The Uncanny X-Men #199, "The Spiral Path" (November 1985)
- ↑ 4.0 4.1 The Uncanny X-Men #142, "Mind Out of Time!" (February 1981)
- ↑ The Uncanny X-Men #200, "The Trial of Magneto!" (December 1985)
- ↑ The Uncanny X-Men #184 "The Past... of Future Days" (August 1984)
- ↑ The Uncanny X-Men #193, "Warhunt 2" (May 1985)
- ↑ New Mutants #18 (August 1984)
- ↑ Excalibur #66 and #67 (June-July 1993)
- ↑ Excalibur #94 (February 1996)