User:MrThermomanPreacher/Rebooted universe (The Big Bang)

The Eleventh Doctor was forced to "reboot" the universe in Big Bang Two after the Total Collapse Event Incident endangered the post-Time War universe, initially cracking it before reducing it to a starless world. The Doctor was assisted by Amy Pond, Rory Williams and River Song, and so the four of them were the only ones known to remember the circumstances of the universe's reboot. (TV: The Big Bang) The Doctor would continue to live in this rebooted universe in further incarnations, including as the Thirteenth Doctor. (PROSE: Dalek Combat Training Manual)

History
The Doctor rebooted the universe by using the Pandorica, created by the Alliance to prevent the total event collapse, which they mistakenly believed he was responsible for. Wiring himself into the Pandorica, the Docotr initiated Big Bang Two using its restoration field powered by explosion of the TARDIS, the cause of the total event collapse. Knowing that, by being contained within the Pandorica, he would be erased from existence, the Doctor piloted the Pandorica into the explosion and found his time stream was unravelling as a side-effect. Before skipping the rest of his "rewind" to oblivion, he left a psychic imprint in the mind of Amy Pond to allow her to remember him back into existence.

Amy woke up on the day of her wedding to Rory Williams where she was greeted by her parents Tabetha and Augustus Pond, who had been lost to the cracks before the reboot. Later that day, the Doctor was returned to the restored universe by Amy and attended her reception. Rory regained his memory of the Doctor upon his arrival; he also remembered being "plastic", having been reconstituted into an Auton after having erased by a crack in time before the reboot. (TV: The Big Bang) River Song, the daughter of Amy and Rory who had been conceived on their wedding night, (TV: A Good Man Goes to War) later encountered the Doctor and Amy at the crash of the Byzantium, before they had experienced the Total Collapse Event. There, she told the Doctor that he would next see her when the Pandorica opened. (TV: Flesh and Stone)

Centuries later from his perspective, the Doctor found a crack on the planet Trenzalore, who he understood to be remaining "scar tissue", a structural weakness in the universe which served as an opening for the Time Lords to return to the universe after the Doctor in all their incarnations saved Gallifrey by relocating it to pocket universe at the end of the Last Great Time War. Ironically, as known by Tasha Lem, it was the Kovarian Chapter who destroyed the TARDIS, thus causing the Total Collapse Event and the resulting cracks, in an attempt to prevent the Doctor from reaching Trenzalore and allowing the Time Lords to return. Knowing that their enemies were waiting above Trenzalore, the Time Lords elected not to return to the universe at that time. (TV: The Time of the Doctor)