In the various Outer Limits episodes, either the human race or all life has ended on various dates in different ways. This page records all of these various doomsdays. Since most, if not all, of them are mutually exclusive, it is likely that each doomsday scenario exists in its own, parallel reality within the story.
Doomsdays by date
Below is a list of doomsdays that have a specific date.
July 24, 1997
Humanity was wiped out along with all mammalian life on this date. 12 years later, a few hundred androids survive, running their own machine society. ("Resurrection")
1998
A virus is released and circulated worldwide by a doomsday cult, resulting in the loss of almost all human life. There are a tiny handful of immune survivors but not a breeding population. ("The Vaccine")
August 25, 2001
This is the date on which the Mac 27 Innobotics android goes rogue and ultimately releases an army of duplicates. This may well be a limited impact isolated incident rather than a doomsday, however if there is a parallel world where it resulted in the extinction of the human race - perhaps that of the episode "Resurrection" - this is where it began within that universe's continuity. ("In Our Own Image")
2001
On this date an alien plant releases her seeds on the wind in a large city. Given the voracious nature of the predatory plant species, it will rapidly destroy all animal life on Earth. ("Flower Child")
2015
Seven billion people, amounting to 99% of the world's population, were killed in the Great War. Soon afterwards, a plague known as the Scourge wiped out all of the remaining males. ("Lithia")
November 3, 2046
A nuclear war has annihilated all life on the surface of the Earth and there is but one known human survivor, Aidan Hunter. ("Bits of Love")
April 23, 2084
All human life is extinguished in 2084 by a nuclear holocaust. The handful of survivors of that disaster then arrive on Ganymede which has been rendered uninhabitable for them in an engineered disaster by a suicidal military man. ("The Human Factor (2002)")
2148
The world has been destroyed by a biological disaster that begins in the last quarter of the 20th century created by a scientist named Bertram Cabot, Jr. Whilst a time loop guarantees this outcome will occur, a new timeline is created in the episode where the disaster does not occur. ("The Man Who Was Never Born")
July 2163
An alien computer virus that can transfer to the electrical component of the human nervous system infects the crew of a spaceship. The same virus is then downloaded to Earth, infecting the entire human race with a psychosis-causing virus that will inevitably doom humanity to total extinction in the time it takes everyone to kill each other and themselves. ("Manifest Destiny")
2964
The Kyben descended from the sky and destroyed all human life. A counterweapon also eradicated all life and will persist for 200 years, meaning there can be no restoration until 3164 at the earliest. ("Demon with a Glass Hand")
Partial Doomsdays
January 1996
A solar flare wipes out half the Earth, boiling the sea and incinerating the land on the half facing the Sun. The other half of the planet is wrecked and almost all human life wiped out. Massive flooding, fires and super-hurricanes devastate the planet. There are a handful of survivors. ("Inconstant Moon")
Date Unknown, 21st Century
A failed anti-matter experiment on the Moon destroys half of Earth as well as wiping out the Moon itself. This does not immediately make the human race extinct but the ongoing effects amount to a wiping out of a huge number of people. ("Phobos Rising")
June 2059
Over six billion people were killed in the War of 2059 and the world voluntarily entered a technological dark age. ("Final Appeal")
Doomsdays without an exact date
Humanity was defeated on the evening of the US Presidential Inauguration Day by a species of aliens seeking peaceful coexistence who humanity attacked out of fear. It is possible that only America and Russia were destroyed in this episode. ("Trial by Fire")
A chemical rain exposes 95–97% of the Earth’s population to a sterilyzing agent called Teradoxyn. “The birthrate of viables has already fallen to near-zero.” Although there is an optimistic note at the end of the episode for an individual couple and their baby, the tiny number of viable pregnancies probably means that the human race will decline and become extinct in a relatively short period of time. ("Dark Rain")
The children of Earth have been exterminated and the adults turned into sterile immortal slaves with deep mind control destroying their will. There is mention of a resistance so there is a restricted population of fertile humans but in insignificant near-extinction low numbers. ("The Deprogrammers")
The world is conquered and the human race exterminated by alien parasite invaders. However, shortly after the 366th day after the aliens' appearance, a surviving human controlling a doomsday device will expire, and with his death the doomsday device will activate, killing all life on Earth. ("Dead Man's Switch")
Half the western hemisphere is annihilated by a doomsday weapon triggered after the extremely ill advised and risky exercise goes horribly wrong. ("Nightmare (1998)")
In a future time, aliens trick the crew of the Light Brigade into dropping a subatomic bomb on Earth instead of its original target the hostile aliens' homeworld. The bomb destroys the Earth completely. "The Light Brigade"
At some point after the 1990s, humans began to experiment with genetic engineering to the point that after creating a variety of mutants the entire species became infertile and went extinct by the 23rd Century. ("The Origin of Species")