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Many hypothetical doomsday devices are based on the fact that salted hydrogen bombs can create large amounts of nuclear fallout.

A doomsday device is a hypothetical construction — usually a weapon — which could destroy all life on the Earth, or destroy the Earth itself (bringing "doomsday", a term used for the end of planet Earth).

Doomsday devices have been present in literature and art especially in the twentieth century, when advances in science and technology allowed humans to imagine a definite and plausible way of actively destroying the world or all life on it (or at least human life). Many classics in the genre of science fiction take up the theme in this respect, especially The Purple Cloud (1901) by M. P. Shiel in which the accidental release of a chemical gas kills all people on the planet.^[1]

After the advent of nuclear weapons, especially hydrogen bombs, they have usually been the dominant components of fictional doomsday devices. RAND strategist Herman Kahn proposed a "Doomsday Machine" in the 1950s which would consist of a computer linked to a stockpile of hydrogen bombs, programmed to detonate them all and bathe the planet in nuclear fallout at the signal of an impending nuclear attack from another nation. Such a scheme, fictional as it was, epitomized for many the extremes of the suicidal logic behind the strategy of mutually assured destruction, and it was famously parodied in the Stanley Kubrick film from 1964, Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb. It is also a main topic of the movie Beneath the Planet of the Apes, in parallel with the species extermination theme. Most such models either rely on the fact that hydrogen bombs can be made arbitrarily large (see Teller-Ulam design) or that they can be "salted" with materials designed to create long-lasting and hazardous fallout (e.g. a cobalt bomb).

See also: Doomsday film

Use of this concept has occurred more than seven times in popular entertainment.

• In the film Dr. Strangelove, the Soviet Ambassador, upon learning that the Americans could not call back a bomber set to deliver nuclear weapons inside the Soviet Union, informs the President that Soviet Premier Kisof had ordered the creation of a doomsday device. The existence of the device hadn't yet been announced, because it was going to be announced later in the week, making it useless, at the time, for its intended purpose of deterring nuclear attack.
• In the Star Trek episode The Doomsday Machine, a conical planet killer goes on a planet destroying rampage, its projected path threatening "...the very heart of the Federation". Captain Kirk speculates that the machine was created as a doomsday device, and used, thus destroying its creators and then going on a random path of destruction.
• In Kurt Vonnegut's novel Cat's Cradle, a doomsday substance called ice-nine is created with the capability to freeze all the water on Earth. The creator of ice-nine is depicted as being willfully negligent of the practical dangers of his research, and it is carelessness in the handling of the substance which causes the Earth to freeze.
• In the novel Life, the Universe and Everything by Douglas Adams, the supercomputer Hactar was asked by the Silastic Armorfiends of Striterax to "create the ultimate weapon." When he asked them what they meant by ultimate, he was told to "see a bloody dictionary", and concluded that they wanted him to destroy the universe. Hactar, reasoning that the known consequences of setting off such a device are worse than any possible consequence of not setting it off, creates a non-functional one. The device Hactar created was designed to be "a very small bomb" that was simply a "junction box in Hyperspace that would, when activated, connect the heart of every major sun with the heart of every other major sun", thus destroying the Universe in one gigantic Hyperspacial-Supernova. However, as stated, Hactar ensured that the device was non-functional.
• In Robert McCammon's novel, Swan Song, the President of the United States, delusional and believing himself God fallen from heaven, decides that evil has won on Earth (after the nuclear holocaust he helped induce) and the planet must therefore be purged using the Talons of Heaven. This concept involves firing a massive payload of nuclear weapons at the poles, knocking the earth off its axis, causing massive icecap melting and subsequent flooding.
• In Futurama, Professor Farnsworth is known to possess several doomsday devices, which (ironically) infrequently come in handy for saving the universe.
• In the video game Halo, the central plot device, Halo, was designed to eradicate all organic life in the galaxy, ironically to stop the very enemy threatening it.
• In the Matthew Reilly book Temple, a doomsday device consisting of a pair of nuclear warheads and the non-existent element Thyrium is capable of obliterating a large section of Earth (Reportedly 1/3 of the Earth's mass). This would knock the planet out of orbit and create a cloud covering the entire planet that would wipe out the world's population.
• In the book Ender's Game by Orson Scott Card, the Molecular Disruption Device can destroy an object, and any object near it, such as a fleet of space ships. Eventuality it is used on a planet near the Bugger's main fleet, destroying it, and ending a long war. In the sequels Speaker for the Dead and Children of the Mind the threat of the MD Device (also called "Dr. Device") looms over a human colony on a world with a newly discovered sentient species.
• In the Discworld story The Last Hero by Terry Pratchett, Cohen the Barbarian plans to detonate an explosive called Agatean Thunder Clay at the Hub, to show the gods how annoyed he is with them. Unknown to him, this would disrupt the Discworld's standing magical field, thereby rendering it impossible for it to exist.
• In Beneath the Planet of the Apes, the "Alpha-Omega bomb" works by igniting the atmosphere.
• In the Battalion Wars universe, the Solar Empire used something called a "Doomsday Device", which focused the sun's light and heat into a beam, which they used to destroy Xylvania 's Iron Legion.
• In Star Wars: A New Hope and Star Wars: Return of the Jedi, both Death Stars have the capacity to destroy entire planets.
• In Star Wars: Knights of the Old Republic II: The Sith Lords, Bao-Dur creates a device called the Mass Shadow Generator. This weapon destroyed entire fleets of spacecraft as its cataclysmic explosions are too strong for anything to survive.
• In the James Bond movie Moonraker, Sir Hugo Drax creates a doomsday device -a poison dispersed by satellites- to eradicate all human life on earth. Afterwards, he wants to re-inhabit the earth using a colony of "perfect" human beings, orbiting in space while the doomsday device is active.
• The Tom Clancy book Rainbow Six has a plot line in which a wealthy industrialist develops an airborne virus and an "antidote" to the virus that will actually spread the effects further, and will be released during the Sydney Olympics, with the so-called antidote actually being lethal to everyone not previously inoculated by the "real" antidote, and only his group of people who have been so inoculated will be alive to repopulate the earth.
• In the cartoon series The Flintstones, the character The Great Gazoo is sent to earth as punishment for creating a button which would annihilate the entire universe.
• In the 1987 spy comedy Real Men, the climax of the movie involves two CIA agents charged with the task of receiving, on behalf of the U.S. government, a choice of one of two gifts from a group of extraterrestrials. One of the choices is referred to only as "The Big Gun", a weapon apparently capable of destroying the entire old Soviet Union (along with the United States). The other choice is called "The Good Package". (Neither device is ever actually seen on screen, nor has its function described in great detail and for purposes of the story either one can be regarded as a Big Dumb Object).
• In the DC comics universe, Darkseid, the main antagonist in Jack Kirby’s Fourth World is obsessed with finding the Anti-Life Equation, a mathematical formula that would theoretically nullify all life in the universe instantaneously.
• The final story arc of the animated television series Exosquad is dedicated to the dictator Phaeton's attempt to detonate a doomsday device on Earth as revenge for the destruction of his homeplanet Mars.
• In the videogame Warzone 2100, a nuclear missile defense system gets infected with a computer virus, launching missile strikes to all major cities of the world. This event creates the phenomena called nuclear winter.
• In the videogame Probotector Aliens steal the x-drive to create a doomsday device and destroy the earth.
• Use of multiple nuclear weapons causing the destruction or virtual destruction of all life on Earth as a type of doomsday scenario has been used in several fictional stories, including Nevil Shute's On the Beach and David Graham's Down to a Sunless Sea.
• In the videogame Evil Genius, the player has to construct a doomsday device so that the world leaders bow to your will and hand you over the whole world.
• In the ill-fated series finale of Sonic the Hedgehog, Dr. Robotnik created a station called the Doomsday Project, capable of launching saucer-like pods all over Mobius, attacking everyone and everything, forcing them into submission, giving Robotnik his long-awaited total domination. He would've succeeded if it wasn't for Sonic and Sally using the Deep Power Stones.
• On the pilot episode of Evil Con Carne, Hector built a doomsday device that was destroyed by commandos.
• In the videogame Clash at Demonhead, Professor Plum builds a Doomsday Bomb for unknown reasons. It is then hijacked by the terrorist group known as the Governors. The player, in the role of Billy "Big Bang" Blitz, must defeat the governors to gain the special medallions that can deactivate the bomb.
• In the videogame Septerra Core a doomsday device is a biomechanic weapon which can move Septerra's "shells", effectivly killing everyone inhabiting it.

• Doomsday Clock
• Doomsday event
• Escalation
• Planet killer
• World War III
• Weapon of mass destruction

1. ^ Spencer R. Weart, Nuclear fear: a history of images (Cambridge, MA: Harvard University Press, 1988).

• The Purple Cloud by M.P. Shiel hosted by Project Gutenberg.
• "How to destroy the Earth" — humorous page about the difficulty in destroying the entire planet.
• "The Return of the Doomsday Machine?", Ron Rosenbaum, Slate.com, Aug. 31, 2007