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The Gem Monsters, also known as Corrupted Gems, are recurring antagonists of the Cartoon Network TV series Steven Universe.

Throughout the series, the Crystal Gems hunt, collect and bubble their gemstones to their temple to keep Earth safe from them. They take on monstrous forms and have special abilities. Some of them like the Centipeetle Mother and Big Bird are able to make smaller copies of themselves. In Ocean Gem, it's revealed that the Gem Monsters are corrupted gems who were former Crystal Gems and possibly Homeworld Gems who became unable to sustain sentience and humanoid forms due to the Diamonds sent out a Corrupting Light.

Known Corrupted Gems

Comicbook

  • Obelisk
  • Rainbow Cloud Monster
  • Old Book Gem
  • Snowbeast
  • Slug Monster
  • Plant Monster
  • Manta Ray
  • Clock Tower
  • Unknown Giant Bird
  • The Perils of Pweepwee
  • Vine Monsters

Gallery

           Steven Universe Villains

Great Diamond Authority | White Diamond | Yellow Diamond | Blue Diamond | Pink Diamond | Homeworld Gems | Peridot | Lapis Lazuli | Jasper | Yellow Diamond's Pearl | Blue Diamond's Pearl | Eyeball Ruby | Navy Ruby | Holly Blue Agate | Aquamarine | Topaz | Robonoids | Fusion Gems | Sugilite | Malachite | Unknown Quartz Fusion | Gem Monsters | Centipeetle Mother | Gem Cave Creature | Big Bird | Watermelon Tourmaline | Ice Monster | Invisible Gem Monster | Lighthouse Gem Monster | Slinker | Crab Gem Monster | Great North Gem Monsters | Cluster | Bismuth | Marty | Frybo