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"I don't know what happened to Antonio Bay tonight. Something came out of the fog and tried to destroy us. In one moment, it vanished. But if this has been anything but a nightmare, and if we don't wake up to find ourselves safe in our beds, it could come again. To the ships at sea who can hear my voice, look across the water, into the darkness. Look for the fog."
—Stevie Wayne:, The Fog (1980)
"I've seen fog so thick you could cut it, but none that could cut me."
—Tahngarth, Fog Elemental flavour text
This isn't the normal mist that comes at a bad time, obscuring vision or providing dramatic tension. It's certainly not that serene mist that comes just after a gentle rain... no, this fog is malevolent and evil and it will get you.
Everyone knows that an Ominous Fog is a bad sign in movies, books, and television shows. One of the most sure-fire ways of generating that edgy feeling of paranoia is to enshroud the setting in a dense, opaque mist. Because anything could be hiding in there...
An Ominous Fog turns into a Fog of Doom when it is trying to bite you. Sometimes the fog itself is the threat. No mere mist, the Fog of Doom is often poisonous, or acidic, or causes men to go mad. Other times, the Fog of Doom conceals other threats that come out of the mist to take and devour you so quickly that your friends don't even know you're gone until they look around and see you're just not there.
Either way, you better avoid walking into a mist at all costs.
This trope also can include other sight obscuring conditions such as dust storms (seen in the Mummy), supernatural darkness, or smoke; fog is simply the most common mechanism to achieve the effect.
Anime And Manga
- Jo Jos Bizarre Adventure had mist that turns you into a zombie.
- The ninjas of Kirigakure (meaning "Hidden Mist") in Naruto use fog for their silent killing techniques. So, it's not the fog trying to kill you, but ninjas in control of the fog trying to kill you.
- Somewhat, in one of the Pokemon mangas there was a Haunter called the "Back Fog". Yeah, he wasn't friendly.
- In John Carpenter's The Fog, undead pirates came out of the mist to seek their revenge.
- In Tim Burton's Sleepy Hollow the fog actually reaches out and puts out the torches around the village before the headless rider comes out of it.
- The Ten Commandments (1956). The tenth plague that kills all the firstborn in Egypt is depicted as this.
- 28 Weeks Later had the poison gas the US Army unleashed on London in its attempt to kill off the remaining Infected.
- The whole concept of The Mist.
- The Trollenberg Terror (aka The Crawling Eye) has a giant, disembodied eye emerging from its hiding place inside a radioactive cloud to attack its victims.
- A strange ecosystem came out of the fog in Stephen King's The Mist.
- Creepy fog-cloaked areas called "thinnies" are a rare, but deadly and unpredictable hazard in King's The Dark Tower series.
- In Larry Niven's For A Foggy Night, the mist isn't actually mist, but is rather times when the various alternate timelines intermesh. When you walk out into a fog, you're actually walking into an alternate world... its just that most of the time the "alternate" is so close to your original world you never notice. But sometimes, just sometimes, you cross over into a world that's completely different...
- Michael Moorcock's Elric of Melnibone has the Groaning Mist, which after enveloping its victims attempts to drive them insane with hallucinatory voices whispering of their fears and inadequacies.
- In Fritz Leiber's Lankhmar story The Cloud of Hate, the titular cloud turns people into killers.
- The Wheel of Time has a city full of murderous mist. Touching the corrupted fog of Shadar Logoth will either kill you outright or infect you with an eventually-lethal Hate Plague. Originally, the fog was contained in the city, but once one of the infected escaped into the countryside, it came with him, and is now (under the command of the aforesaid infectee) capable of forming spontaneously in unexpected places and ripping apart everyone within.
- The Mind Fog is a creepy and illegal magical effect in The Dresden Files.
- In William King's Warhammer 40000 Space Wolf novel Grey Hunters, the Chaos forces cause a green and yellow fog to boil up. It obscures vision, allows their enemies to sneak up, and contains some kind of poison.
- The Fog from James Herbert back in 1975, not related to the John Carpenter film of the same name. In this novel, a fog descends over Britain that turns almost the entire population insane.
- M.P. Shiel's 1901 novel The Purple Cloud has nearly the entire human and animal population of Earth being killed off by the mysterious title cloud.
- The Tales from Camp Crystal Lake series of books by Eric Morse  all feature a yellow fog which seems to make everyone feel more negatively, lubricating the lethal intentions of whomever finds the hockey mask as well as the Final Girl.
- In Robert E. Howard's Conan the Barbarian story "Black Colossus", the Evil Sorcerer foe sends a mist over the desert to block his army's sight.
- Features in The Hunger Games. The fog in question is a kind of nerve gas that burns the skin and causes seizures and muscle failure.
- In Septimus Heap, the bank of Fog surrounding the House of Foryx conceals an Abyss.
- Tales of the Magic Land (a series of loose Russian translations of the Wizard of Oz books) has a book aptly named The Yellow Fog where a witch named Arachna who attempts to subdue the Magic Land with the titular fog. While not lethal (it's meant to subdue rather than exterminate, after all), it has several negative effects: it's toxic, for one, and it also blocks off the sun leading to intense cold in the usually winterless Magic Land.
- In Mistborn, the mysterious threat called the Deepness is actually the normally benign mists, which Ruin intensified until they form a crop-killing particulate winter.
Live Action TV
- Star Trek: The Original Series episode "Obsession", with the star traveling vampire cloud.
- Mistfall in the Doctor Who serial Full Circle.
- The mist-loving Sea Zombies in the Dungeons and Dragons Greyhawk Adventures supplement were
a ripoff ofinspired by John Carpenter's zombies.
- Dungeons and Dragons also features air elementals, which are clouds that try to kill you.
- Ravenloft's most iconic set-piece is The Mists that hang over most of the Land, and this is often used as a means to pluck players out of their home world. It gets to a point where experienced players will run screaming from the slightest sign of mist. One of the nastiest salient powers mentioned in the Ravenloft supplement Van Richten's Guide To Vampires was the possibility of a Patriarch vampire using its energy-drain ability while in mist-form. This was a particularly terrifying prospect under 2nd Edition rules, when there was virtually no way to fight back against a gaseous-form opponent.
- There was also a spell call Murderous Mist, which was a druid spell that created hot steam that could boil your eyes. Then again, there are even the more classic Cloudkill and Acid Fog spells.
- In the Villains and Vigilantes adventure Devil's Domain, killing demons released a cloud that caused humans to go insane and attack you.
- London in Unhallowed Metropolis is cloaked in heavily toxic smog. Going outside without a gas mask or at least a damp cloth to cover your mouth and nose causes unconsciousness in short order, and death not too long after. Direct sunlight penetrating the smog layer is rare, and on the worst days, it blots out the sun entirely. There's nothing supernatural or actively malevolent about it, but that's a small comfort.
- In Bionicle, Lesovikk encounters a sentient acid cloud while he's trapped in a Lotus Eater Machine. He easily defeats it by blowing it away.
- Legend of Legaia provides a misguided Big Bad who creates the Fog of Doom, which warps the titular Utopia into a Crapsack World. But otherwise, the fog was harmless. Unless you were wearing a Seru, as the fog turned those, and anyone who was wearing one, into a horrible monster. And given that, before the fog, everyone was using them non-stop to do everything, it was a fog of doom. Oh, and if you ran into one of those previously mentioned monsters that were lurking in the mist just outside of the few remaining safe havens, you were screwed, since ordinary weapons were worse than useless against them.
- In the City of Heroes MMORPG, Dark Astoria is a zone covered in a frustratingly opaque mist, filled with arcane and supernatural enemies. For extra points, all of the neighborhoods and landmarks in Dark Astoria are named after old school horror authors, filmmakers, and characters. Adding to the creepy lethality of the zone, players can see vague images of the zone's long-dead inhabitants in the mist... who fade upon approaching.
- Final Fantasy IX's Fog of Doom was the source of many a scary monster. On the other hand, it was also the source of many a black mage.
- The miasma of Final Fantasy Crystal Chronicles.
- There was a fog in Blue Dragon that inebriates its inhalers. And it's at sea. Close to rocks to run into.
- Some of the early pre-release materials for Silent Hill Origins suggested that the town's Ominous Fog would cross the line to become an active, amorphous enemy. The game switched production teams midway through development, and though a later sequel, Silent Hill Homecoming, did feature an otherwise corporeal monster named "Smog", the Fog of Doom idea never panned out.
- The fog that appears in the TV World in Persona 4. It causes fatigue for those not wearing special glasses that allow them to see in it. It crosses over to the real world every so often and when it recedes, corpses are found in high places.
- The Kvaldir, also known as the walkers of the fog, from World of Warcraft are ghostly sea raiders who only show up in areas of very heavy fog. There's also the noxious orange mist that passes for atmosphere in the zombie-infested Plaguelands. In high enough concentrations, it's a vector for the Scourge.
- In Lost Kingdoms, the black mist contains monsters and is the influence of the Big Bad. A Sidequest reveals a scientist who tried to save his hometown, but ended up creating a white mist containing weird monsters.
- In Castlevania: Symphony of the Night, Alucard can actually change into a playable Fog of Doom once you've found the right items: with the "Form of Mist" and "Gas Cloud" relics, his mist form is invincible and causes damage to any enemies within it, while constantly draining a small amount of MP. It's every bit the Game Breaker it sounds like, though you can only get it near the end of the game.
- The creepy fog in Sei-an City in Okami is slowly killing everyone in the city. Turns out it's caused by a monster called Blight, which is living in the Emperor's Stomach.
- Deadly Premonition has a purple fog which drives people insane.
- The Legend of Zelda Twilight Princess, once you head to the Forest Temple in human form with Midna, you have to go through a mass of purple fog following a monkey with your lantern. The fog doesn't affect your enemies, sadly, making it very annoying when you're running along and the monkey suddenly stops in terror and you careen into purple death. The mist in the Earth Temple of The Legend of Zelda the Wind Waker is infamous for not only robbing you of your item use, but also for concealing none other than the dreaded Floormasters.
- Freelancer has a number of nebulae that will corrode your hull, bombard you with radiation, or conceal pirates or Nomads.
- It's just like they say in First Encounter Assault Recon : #$@&ING RUN!!!
- In the latest version of Dwarf Fortress the surfaces of evil regions have a variety of clouds of randomly named materials ("execrable soot", "accursed gloom", etc) which cause randomly determined symptoms, ranging from mild dizziness to all of your internal organs rotting to becoming a zombie.
- One Treehouse Of Terror episode of The Simpsons had a fog that turns people inside out.
- One episode of Danger Mouse has the "Dreaded Fog Monster of Old London Town". It being a kid's cartoon, the Fog is more of a prankster than a threat.
- Xiaolin Showdown had the Woozy Shooter. It induces a Mushroom Samba in its victim, and the user can take advantage of that.
- The cloud of Joker Venom that The Joker doses Gotham with in one Batman: The Animated Series episode could qualify as the 'insanity-inducing' variant... But you had to be exposed to it for a long time in order for the insanity to take effect.
- From Friday the 5th of December to Tuesday the 9th of December, 1952, London was enshrouded with what has come to be called the Great Smog of 1952. One of the worst pollution episodes in history, the Great Smog killed nearly 4000 people, and hospitalized nearly 100,000 more from respiratory tract infections and hypoxia (the inability to get enough oxygen).
- A nearly identical situation happened in the mill town of Donora, PA in 1948 which led to the death of 20 and the infection of nearly 7,000, nearly half of the town's population, from respiratory illness. The smog also left many survivors with lasting illness. The event is still considered one of the worst environmental disasters in US history.
- Take the inherent danger of driving in thick fog with some Californians' infamous driving habits...and you have a recipe for disaster.
- On August 21, 1986, volcanic activity released a massive amount of carbon dioxide into Lake Nyos in Cameroon. The gas emerged from the water's surface as a massive cloud that (due to CO2 being heavier than air) hugged the ground like a fog bank. This "death fog" engulfed three lakeside villages, killing approximately 2000 people.
- Time and medical statistics have made it increasingly clear that the dust-clouds from the World Trade Center attacks constituted a slow-acting example of this, given the number of rescue personnel who have succumbed to respiratory disease and cancer after breathing in those dust particles.
- The 2010 forest and peat fires in Central Russia caused a Smoke Of Doom in many Russian cities including Moscow. Carbon monoxide is quite a dangerous gas.
- Mother's Day, Jason's Curse, The Carnival and Road Trip