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A gelatinous cube is a fictional monster from the Dungeons & Dragons fantasy role-playing game. It is described as a ten-foot cube of transparent gelatinous ooze, which is able to absorb and digest organic matter.

Creative origins

Oozes are relatively common antagonists in fantasy fiction; in addition to the oozes of Dungeons & Dragons, examples include the monster from the film The Blob,[1] slime in Dragon Quest, and flan in Final Fantasy. These fictional oozes may have been inspired by microscopic organisms such as amoebae, which, like oozes, can consume organic matter by engulfing it (phagocytosis).[2]

The gelatinous cube is an invention of Gary Gygax, rather than being lifted from outside sources and adapted to a roleplaying setting, as were many mythological monsters like the minotaur and dryad,[1] all of which appeared in the 1974 Monsters & Treasure book of the original boxed set.

Being a cube that is a perfect ten feet on each side, it is specifically and perfectly "adapted" to its native environment, the standard, by dungeon corridors which were ubiquitous in the earliest Dungeons & Dragons modules.[1]

Publication history

The gelatinous cube first appeared in the original Dungeons & Dragons "white box" set (1974),[3] and its first supplement, Greyhawk (1975).[4]

The gelatinous cube appeared in the Dungeons & Dragons Basic Set (1977, 1981, 1983). The gelatinous cube also appeared in the Dungeons & Dragons Rules Cyclopedia (1991).[5]

The gelatinous cube appeared in first edition Advanced Dungeons & Dragons in the original Monster Manual (1977).[6] The creature was further developed in Dragon #124 (August 1987).[7] Published first edition Advanced Dungeons & Dragons adventures which included gelatinous cubes as adversaries that the player characters encounter included "The Ruins of Andril", published in Dragon #81.[8]

The gelatinous cube appeared in second edition in Monstrous Compendium Volume One (1989),[9] and the Monstrous Manual (1993) under the "ooze/slime/jelly" heading.[10]

Under the ooze entry, the gelatinous cube appears in the third edition Monster Manual (2000),[11] the 3.5 revised Monster Manual (2003),[12] the fourth edition Monster Manual (2008),[13] the Monster Vault (2010),[14] and the fifth edition Monster Manual (2014).[15]

Other publishers

The gelatinous cube is fully detailed in Paizo Publishing's book Dungeon Denizens Revisited (2009), on pages 16–21.[16]


A gelatinous cube looks like a transparent ooze of mindless, gelatinous matter in the shape of a cube. The cube's transparency coupled with a dimly-lit dungeon gives it the element of surprise to engulf unsuspecting beings, and only an alert adventurer will notice the cube. The cube slides through dungeon corridors, being able to mold its body to flow around objects and fit through narrow passages and then returning to its original shape once enough space is available. A cube will absorb everything in its path, with its acidic digestive juices dissolving everything organic and secreting non-digestible matter in its wake. David M. Ewalt, in his book Of Dice and Men, describes the gelatinous cube as "a dungeon scavenger, a living mound of transparent jelly",[17] The Ashgate Encyclopedia of Literary and Cinematic Monsters called it a "dungeon clean up crew", well adapted to this unique fictious ecosystem.[1]


Tyler Linn of Cracked.com identified the gelatinous cube as one of "15 Idiotic Dungeons and Dragons Monsters" in 2009, stating: "Unless an encounter plays out exactly like the steamroller scene in Austin Powers, we fail to see how the Gelatinous Cube ever kills anybody who's not either glued to the floor or fast asleep. In fact, we're pretty sure the Dungeon Master's Guide reads: The first player to ask "Can't I just get out of the way?" automatically defeats the Gelatinous Cube."[18]

Rob Bricken from io9 named the gelatinous cube as the 5th most memorable D&D monster.[19]

Chris Sims of the on-line magazine Comics Alliance stated of the gelatinous cube that "there can be no question of what is the greatest monster" in D&D, calling the gelatinous cube "amazing".[20]

The Ashgate Encyclopedia of Literary and Cinematic Monsters called the gelatinous cube one of the "iconic monsters" of the D&D game.[21]

In other media

The gelatinous cube appeared in the television series Adventure Time by Pendleton Ward.[21]


  1. 1.0 1.1 1.2 1.3
  2. Gygax, Gary, and Dave Arneson. Dungeons & Dragons (3-Volume Set) (TSR, 1974)
  3. Gygax, Gary and Robert Kuntz. Supplement I: Greyhawk (TSR, 1975)
  4. Allston, Aaron, Steven E. Schend, Jon Pickens, and Dori Watry. Dungeons & Dragons Rules Cyclopedia (TSR, 1991)
  5. Gygax, Gary. Monster Manual (TSR, 1977)
  6. Greenwood, Ed. "The Ecology of the Gelatinous Cube." Dragon Magazine #124 (TSR, 1987)
  7. The Ruins of Andril: An AD&D adventure for 4-8 characters, levels 8-11, Dragon, p.41–56. January 1984. (Temporary fix for {{cite journal}}, please update to use {{cite dragon}} and similar templates.)
  8. Cook, David "Zeb", et al. Monstrous Compendium Volume One (TSR, 1989)
  9. Stewart, Doug, ed. Monstrous Manual (TSR, 1994)
  10. Williams, Skip, Jonathan Tweet, and Monte Cook. Monster Manual (Wizards of the Coast, 2000)
  11. Cook, Monte, Jonathan Tweet, and Skip Williams. Monster Manual (Wizards of the Coast, 2003)
  12. Mearls, Mike, Stephen Schubert, and James Wyatt. Monster Manual (Wizards of the Coast, 2008)
  13. Thompson, Rodney, Bonner Logan, and Sernett, Matthew. Monster Vault (Wizards of the Coast, 2010)
  14. Mearls, Mike, Crawford, Jeremy, and Perkins, Christopher. Monster Manual (Wizards of the Coast, 2014)
  15. Clinton Boomer, Jason Bulmahn, Joshua J. Frost, Nicolas Logue, Robert McCreary, Jason Nelson, Richard Pett, Sean K Reynolds, James L. Sutter, and Greg A. Vaughan. Dungeon Denizens Revisited (Paizo, 2009)
  16. 15 Idiotic Dungeons and Dragons Monsters
  17. The 10 Most Memorable Dungeons & Dragons Monsters, , p.. September 16, 2013. (Temporary fix for {{cite journal}}, please update to use {{cite dragon}} and similar templates.)
  18. Ask Chris #125: The Greatest Monsters in 'Dungeons & Dragons', , p.. October 19, 2012. (Temporary fix for {{cite journal}}, please update to use {{cite dragon}} and similar templates.)
  19. 21.0 21.1

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