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The Trench Monsters are a group of large, ravenous monsters that live in a trench in the outskirts of Bikini Bottom and Shell City, similar to the town of Rock Bottom. They are featured in The SpongeBob SquarePants Movie, where SpongeBob and Patrick had to cross this area where these monsters lived, and the creatures, and beasts were not a threat, since they believe they are "invincible" and nothing can hurt them, seeing how Princess Mindy gave them "Mermaid Magic" turning them into men. These monsters really wanted to eat them, until they went along with the song and became their friends, only to be turned down after the "Men" called them hideous, and disgusting. They make cameo appearances in "A Life in a Day," in which Patrick attempts to jump over them on a skateboard, and in "The Night Patty," in which smaller versions of them visit the Krusty Krab during the night shift. They also appear in the comic Grandma's Cookies as an obstacle.


  • A Purple Anglerfish
  • A Translucent fish
  • A Giant Humbolt Squid
  • A Humongous Black Eel
  • A Gigantic Snail, with eyes for his shell
  • A 3 eyed Red Monster
  • A Black monster, with flexible eye stalks
  • A Green monster, with hands for eyes
  • A Giant Lobster (Game only)
  • A Giant blue Crab
  • Rock Beasts
  • An 8 eyed Squid (Game only)
  • See through fish monster
  • A Big yellow monster, with an eyestalk
  • 3 slow monsters
  • Giant red eel
  • A Giant green hand
  • A Giant Green Crab
  • A Purple Ball monster
  • A Three-eyed Green Fish Monster
  • A Giant magenta Clam, with one eye and teeth
  • A Big orange fish monster
  • A Black lobster/dragon monster
  • A One eyed Teal Monster, with green arms on its head
  • A Giant Red Squid



Title Role(s) in episode
"A Life in a Day" (tr) Cameo
"The Night Patty" (tr) Cameo


Title Role(s) in episode
"The SpongeBob SquarePants Movie" (tr) Minor





  • Most of them are based on real deep-sea creatures, such as the anglerfish and Humboldt squid.
  • The Monster making the yelping sounds at the stairs is not actually seen.
  • The light on the road-like monster is designed to look like a traffic light.
  • In the movie monsters are huge, but in "Night Patty" they are about in SpongeBob's size.
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