History Main / OminousCube

* The multi-purpose "Black Box" in the ''Franchise/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...]]

** ''Film/ZackSnydersJusticeLeague'': this version of the Unity can turn into a devastating FantasticNuke. In addition, the mother Boxes are sentient and tempt Cyborg when he's trying to dismantle them.

* ''Film/{{Justice League|2017}}'': The Mother Boxes are three alien cubes that, [[DismantledMacGuffin when united]], are capable of terraforming a planet into a DeathWorld like Steppenwolf's homeland.

* Parodied in ''VideoGame/SouthParkTheFracturedButWhole'' with "The Cube of Ultimate Destruction", which is just a Rubik's Cube. The Coon remarks it has the power to destroy the Milky Way galaxy. [[spoiler:He isn't kidding.]]

* ''Manga/JujutsuKaisen'': In order to seal away the powerful Satoru Gojo, the Disaster Curses conspire to use a cursed tool known as "Prison Realm", which takes the form of a cube-like object with strange markings on it.

* ''VideoGame/TheLegendOfHeroesTrailsInTheSky'': The 3rd game has the Arca of Recluse which uses [[spoiler: Kevin's memories to recreate places in Phantasma]], allows teleportation across explored places and activates monuments, among other things.
* ''VideoGame/LegendOfGrimrock'' has this as the FinalBoss, as the cube was an ancient threat that Grimlock [[SealedEvilInACan was intended to keep contained.]]

** In another ''ST:TOS'' episode, "That Which Survives", a computer left by the extinct Kalandan people on an artificial planet outpost is in the form of a glowing cube suspended from the ceiling. It's left continuing it's last programming to defend the outpost from any non-Kalandans by creating constructs in the form of the outpost's long-dead commander to kill intruders and sabotage their ships.

** In another ''ST:TOS'' episode, "That Which Survives", a computer left by the extinct Kalandan people on the artificial planet is in the form of a glowing cube suspended from the ceiling.

* ''{{Film/Justice League|2017}}'': The Mother Boxes are three alien cubes that, [[DismantledMacGuffin when united]], are capable of terraforming a planet into a DeathWorld like Steppenwolf's homeland.

* ''Series/AgentsOfSHIELD'': The Toolbox is a tiny cube-shaped database that contains the entirety of SHIELD's files.

[[folder:Webcomics]]

[[folder:Web Video]]

* In ''TabletopGame/{{Planescape}}'' Archeron is the LawfulNeutral plane with a tendency toward LawfulEvil. It is an infinite expanse of space with metallic cubes floating through it that range from the size of small islands to the size of continents. Armies of evil-aligned beings like hobgoblins and orcs live on these cubes as do the souls of anyone who ever died in combat for a cause they didn't believe in but they accepted money to fight in, and when two cubes come together, their inhabitant swarm out to attack each other.

* In ''VideoGame/FateGrandOrder,'' the fourth Lostbelt has a mysterious black cube that has persisted through all the cycles. Despite its unusual nature, Arjuna Alter thinks nothing of it, and Pepe decides to keep it around against the advice of Wodime to see what it does. [[spoiler:It turns out, it's Jinako/Ganesha sent back in time by Ashwatthama in order to help foil Arjuna Alter's rampage.]]

* The PlotCoupon of the ''{{VideoGame/Cube Escape}}'' series, which represent [[spoiler: peoples' memories in a physical form. White cubes consist of positive memories, black are painful ones, blue cubes can change the past, and golden cubes change the future.]]

* The Black Cube of Darkness from ''WesternAnimation/WanderOverYonder'' parodies this trope. While introduced as a sentient, terrifying supervillain capable of [[SoulEating sucking souls]], he is later shown to be rather lackluster at anything that doesn't involve villainy. After his second appearance, he ends up giving up on villainy and tries his hand at a number of odd jobs. However, everyone (besides Wonder) still fears him.

* The PlotCoupon of the ''Cube Escape'' series, which represent [[spoiler: peoples' memories in a physical form. White cubes consist of positive memories, black are painful ones, blue cubes can change the past, and golden cubes change the future.]]

** In the Classic series Fourth Doctor story arc, "The Key to Time", the titular [[CosmicKeystone Key]] is comprised of a set of six puzzle pieces, which when assembled make a crystal cube.

* ''WebVideo/AHeistWithMarkiplier'': The strange cuboid-shaped artifact that Mark [[SecondPersonNarration and you]] stole from a museum ends up having [[SchrodingersGun wildly different traits]] depending on [[StoryBranching which path you take]]. A few include: [[spoiler:it being a TimeMachine, a record of all of an alien species' knowledge, and a salt shaker.]]