->''"Even in the heart of Heaven...angels can still feel fear."''
-->-- [[spoiler:'''Leah as Diablo''']], ''VideoGame/DiabloIII''

What's the one thing worse than HellOnEarth? When TheLegionsOfHell decide to invade that most holy of places, Heaven itself!

In works that focus on the conflict between HeavenAndHell (which to be fair, includes most works where Heaven and Hell appear as opposing sides) this will be the ultimate goal of Hell, and is usually kept from happening by an EnemyCivilWar or other big conflict among the demons, with the major threat being some ambitious demon or other villain seeking to unify them. Oftentimes, invasion of Heaven is an EvilPlan that the heroes need to stop before it comes to pass, similar to HellOnEarth.

But for those times when things ''truly'' go FromBadToWorse, the demons will launch an all-out onslaught against Heaven, seeking to corrupt or destroy the CouncilOfAngels, the FantasyPantheon, or even [[{{God}} the Big Guy Himself]], with the heroes having the unenviable task of stopping everything from being destroyed (unless they are {{Nay Theist}}s and go all "plague upon both your houses, let's PassThePopcorn and [[DeusExNukina nuke]] [[RageAgainstTheHeavens whoever survives]]"). Since situations like these are nearly always GrandFinale situations, they are usually big spoilers.

Compare HellOnEarth and RageAgainstTheHeavens.

* This is Hell's grand plan in the ''ComicBook/{{Spawn}}'' series, with Hellspawn in charge of gathering souls for Hell's army.
* Subverted in ComicBook/{{Lucifer}}: Hell first defeats the [[spoiler: Lilim]], who are besieging Heaven. Although Heaven surrenders to Hell, this is demonstrated to be the correct moral outcome, since the leader of the Hellish host [[spoiler: Christopher Rudd]] is redeemed.
* This is attempted in ''Ghost Rider'''s "Heaven on Fire" arc since most of the angels are out of commission, but it still fails horribly as the Spirits of Vengeance fill in for them, resulting in much demon ass getting kicked.
* The SpaceOpera version occurs in FinalCrisis with the NewGods: "There was a war in Heaven and the [[{{Darkseid}} Dark Side]] won."

* Wendy Alec's ''The Chronicles of Brothers'' series, a series of Christian polemic novels about the in-fighting between the brethren Gabriel, Michael, Christos and the black sheep of the family, Lucifer. The aforementioned Lucifer tries this on more than one occasion, only to be humiliatingly bitch-slapped by his brother Christos and the lads. As Mrs. Alec's novels follow pretty much exactly the Christian perspective and what is "known" (in the Bible and related sources) about the nature of Heaven and Hell and their denizens, you wonder why Lucifer even bothered... it's in the Bible, you'll never win....
* John Milton's ''Literature/ParadiseLost'' is the trope codifier/forerunner by depicting Satan's rebellion against God.
* The above novel inspired a subverted example of this trope, the ''HisDarkMaterials'' series, where TheLegionsOfHell are actually the ''good'' guys.
* Attempted in the backstory of ''TheSnowQueen''--the devil invents a magic mirror that will make everything look hideous, and he and several of his student demons decide to take it to Heaven so that they can mock God and the angels. The mirror breaks before they can get high enough.

* In ''Series/{{Supernatural}}'', this seems to be Lucifer's PR to his demon mooks after they release him and start the Apocalypse. Meg cheerily taunts a captured Castiel that they're going to win against the angels and invade Heaven itself. In reality, Lucifer wants the demons to have no part in his plans and considers them worthy of annihilation.

* According to the [[http://www.miaminewtimes.com/1997-06-05/news/myths-over-miami/ La Llorona mythos]] believed in by Miami street kids, a demon attack went down in Heaven, and God had to flee. [[HaveYouSeenMyGod No one has seen Him since]], and the angels have to fight off the demons in the meantime. [[HellOnEarth Demons have found a way to invade our world]], and the angels who aren't defending Heaven have come to Earth to fight them.

* In ''TabletopGame/DungeonsAndDragons'', if the Blood War between the demons and the devils ever ends, the Upper Planes can look forward to a full-scale war with the fiends as they launch an invasion. [[spoiler:When the Blood War ''did'' end in the ForgottenRealms setting...this didn't end up happening. Asmodeus permanently shoved the Abyss into a corner of the Great Wheel that couldn't reach them, used the resulting chaos to ascend to full-on godhood, and then settled in and started the clean-up process.]]
* ''{{Exalted}}'': In ''[[GrandFinale Return of the Scarlet Empress]]'' The force of the Demon City [[spoiler:or rather, just the [[ChronicBackstabbingDisorder Ebon Dragon]]]] manages to invade Yu-shan and kills all the Incarnae. What they don't expect, though, [[spoiler:is that the death of the Incarnae [[EleventhHourSuperpower unlocks the god-tier powers of all Celestial Exalts.]]]]

* In ''Theatre/TheRingOfTheNibelung'', Alberich boasts that he will invade Valhalla from Hella once he recovers the Ring.

* This trope makes up the bulk of Act IV, the final act of the regular game of ''VideoGame/DiabloIII''. [[spoiler:Diablo, upon his rebirth as the Prime Evil in the finale of Act III following Adria's betrayal, launches a full-scale assault with all his demonic forces on the High Heavens, seeking to destroy the Crystal Arch and plunge both the Heavens and Sanctuary into darkness forever. Because Diablo has become the embodiment of all seven of the Great Evils in one being, the angels do not have a chance in Heaven ''or'' Hell of stopping him, meaning that you, as the Nephalem, have the task of stopping Diablo and destroying him once and for all. It begins with you having to kill the welcoming committee of demons, has you having to rescue the Archangel of Hope, to bring hope back to Sanctuary and the Heavens, then progresses with you having to destroy Diablo's corruption and the Hell Rifts that his forces are using to invade. Then it's a race to the Crystal Arch, which has you fighting corrupted angels and Diablo's most powerful demons as Heaven's landscape gradually grows more and more Hellish as you go]].
* In ''VideoGame/TitanQuest: The Immortal Throne'', when you reach the Elysium you find out that the heroes there are fighting back the hordes of shades and demons serving Hades, which has gone mad with power. Odder than the standard example because Elysium is still part of Hades's kingdom.
** The final part of ''Titan Quest'' also qualifies as a variation; you have to prevent Typhon, the most fearsome of the Titans from invading Mt Olympus.
* In ''VideoGame/SuperPaperMario'', an army of Skellobits from the Underwhere invades the [[FluffyCloudHeaven Overthere]], where an army of Nimbis rises to fight it. In a twist, said Skellobit army is not affiliated with the leader of the Underwhere [[spoiler: who is actually raising a daughter with her Overthere counterpart]], but with a recently-released SealedEvilInACan who serves as the chapter's boss.
* This is what happens in the True Demon Ending of ''VideoGame/ShinMegamiTenseiIIINocturne''.
* While it doesn't happen literally, this symbolically happens in ''VideoGame/{{Persona 4}}'', when the Investigation Team must go through the Shadow-infested dungeon of [[spoiler:[[FluffyCloudHeaven Heaven]], where [[TheCutie Nanako]] is being held.]]
* This is what the last few levels of ''VideoGame/DisgaeaHourOfDarkness'' are based around. You're the one controlling TheLegionsOfHell. [[spoiler:It turns out to have been a part of a plan cooked up between the guy in charge of heaven and Laharl's father to make sure he ends up as a NobleDemon]].
** While it doesn't happen on-screen, one NonStandardGameOver of ''VideoGame/{{Disgaea 4|A Promise Unforgotten}}'' has Valvatorez and company fighting an extended war against everybody in existence (including God).
* In ''VideoGame/PlanescapeTorment'', [[spoiler:Trias the Betrayer]] was planning to organize an army of fiends to do this to get the gods to wake up and deal with the Blood War, which led to [[spoiler:his incarceration under Curst]].
* The driving plot of ''VideoGame/{{Painkiller}}''. Lucifer is using Purgatory as a staging ground from which to launch an invasion of Heaven, and Daniel Garner is Heaven's hitman chosen to send Lucifer's generals back to Hell to slow down Hell's armies while Heaven prepares.

* In the ''Webcomic/LadySpectraAndSparky'' storyline "Demon War", archfiend Melado and his minions invade the Limbo-like afterlife realm of "Rha-Sha-Shama".

* In one episode of ''WesternAnimation/SouthPark'', the legions of Hell are invading Heaven and Kenny (who is currently [[TheyKilledKenny dead]]) is called on to stop them.
* In the ''Westernanimation/{{Futurama}}'' movie ''The Beast With a Billion Backs'', the living beings in the universe move to Yivo, a kindlly [[EldritchAbomination monstrosity]] whose body is in fact Heaven. Bender misses Fry, so brings his army of damned robots to attack.