Miracle Day

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This article is about the in-universe event. "Miracle Day" is also the umbrella title for series 4 of Torchwood.
The extent of Miracle Day. (TW: The New World)

"Miracle Day" was the name given to the day in the early 21st century on which humans on Earth stopped dying.

Without any immediately obvious cause, awareness of the event took time to develop. One of the earliest survivals was Oswald Danes, a convicted prisoner in the United States about to be executed; although his lethal injection was carried out flawlessly, the only effect was intense but temporary pain from the drugs. As hours passed, doctors around the planet began to realise that deaths of patients under their care (such as Rex Matheson, who was impaled by a metal pole) had abruptly dropped to zero. Age, disease, trauma, and all other normally fatal conditions continued to hurt and debilitate their victims, but without killing them. The level of damage to the body did not matter. Extreme examples include an attempted suicide bomber whose entire body was almost totally burned and pulverized but who retained some degree of consciousness even after his head was detached from the rest of his body, and a CIA agent whose neck was broken, but who managed to stand and stumble away, her head facing backward. News media and the general public also began to realise the change. Eventually, the name of the event emerged on the back of the word "miracle," which began to trend across social networking sites.

Unlike the rest of humanity, Jack Harkness, previously an immortal, became vulnerable to injury and death and also began aging at a normal rate. It was initially unclear if this was a deliberate effect of Miracle Day or if whatever process made humanity immortal simply 'crossed wires' and made him mortal instead.

Beyond medical effects, individuals and societies started to react to Miracle Day in myriad ways:

Without death, the human population began to swell rapidly, increasing pressure on resources and on the species itself. The lack of deaths from any disease and the need to keep treating the sick with new medicines was expected to give viruses and bacteria the chance to evolve into unstoppable "superbugs." It was estimated that within four months, Miracle Day would cause a complete environmental and social collapse. (TW: The New World, Rendition)