History Main / OminousCube

* ''Film/{{Transformers}}'': The [=AllSpark=], the source of all life on Cybertron, instantly transforms any mechanical device that it comes into direct contact with into a sapient entity with its own transforming abilities. The [=AllSpark=] itself is also a SizeShifter, starting off larger than Bumblebee, who is already enormous, then compacting itself to be small enough for a human to carry.

* ''WesternAnimation/ReBoot'': Game Cubes ([[UsefulNotes/NintendoGameCube not those ones]]) sectioned off large portions of the system-cities of The Net, which would either be left intact or destroyed, depending on whether the User lost or won.

* {{Inverted}} in ''VideoGame/Doom3'' with the [[spoiler:Soul Cube]], which is a artifact used against TheLegionsOfHell and eventually seals the portal to Hell that opened up.

-->-- '''Erno Rubik'''

** The UrExample for ''Doctor Who'' appears in "The War Games," in the form of the [[GodzillaThreshold telepathic distress signal]] which the Doctor is forced to create at the story's conclusion. It's good news for the armies which the War Lords have kidnapped, but it's ominous because it means the end for the PowerTrio of the Second Doctor, Jamie, and Zoe.

* ''Series/KamenRiderBuild'': The Pandora Box is an ancient artifact retrieved from Mars that, once it was activated, raised gigantic walls that separated Japan into three sections. It also increased the aggression of everyone that was in the vicinity when it was first activated. [[spoiler:If the box is fully opened, it has the power to completely annihilate all life on a planet.]]

* The multi-purpose "Black Box" in the ''Music/EvilliousChronicles'' can range from this to an UnusuallyUninterestingSight, but the large, looming one in ''LightNovel/MasterOfTheHeavenlyYard'' is a standout example of this trope. Especially with what happens [[YourSoulIsMine when you touch it...]]

* ''VideoGame/{{Fortnite}}'': a giant purple cube first appeared in Battle Royale during Season 5 of Chapter 1. During its [[spoiler:initial]] lifespan, the cube would repeatedly engage in the destrucion of parts of the world.

* ''Film/TheHitchhikersGuideToTheGalaxy'' depicts the Vogon constructor fleet as a net of identical, featureless black cubes encircling the Earth, hovering in the way bricks don't.

[[folder:Web Comics]]

* ''VideoGame/{{Fortnite}}'': a giant purple cube [[FanNickname referred to by the community as "Kevin"]] first appeared in Battle Royale during Season 5 of Chapter 1. During its [[spoiler:initial]] lifespan, the cube would repeatedly engage in the destrucion of parts of the world.

* Downplayed with the Spell Cube from ''Manga/SazanEyes'': it's a metal cube-shaped artifact infused with magic formulae taken by [[EvilGenius Spazug's stash]] of spells hidden in Benares' own stronghold on the Moon... but it's only purpose is to allow the temporarly powerless Yakumo to cast four spells in combat (a fireball spell, a binding spell, a short-range teleport and a protective spell).

* While almost everything in ''{{VideoGame/Minecraft}}'' is made out of cubes, the End Crystals, which explode and can heal the game's final boss, manage to look ominous with their otherworldly appearance and rotating animation.