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Villains Wiki
Villains Wiki

Sinister Slug is a minor antagonist in Spongebob SquarePants. He is one of the many foes of Mermaid Man and Barnacle Boy, and is a terrorous slime creature that lives in the sewers.


In "The Bad Guy Club for Villains", Sinister Slug crawled out of the sewer and wormed up to a gathering of other villains. These were Man Ray, the Dirty Bubble, Atomic Flounder, and Jumbo Shrimp. They were banding together to make a team, known only as BGATFBC. Mermaid Man and Barnacle Boy watched them from an alley and suspected something was up so they tried to stop them.

The BGATFBC held their meeting at Hotel Evil, where Mermaid Man and Barnacle Boy showed up on the scene with a few other superheroes and fought with them. In battle, Sinister Slug slid up the wall and vomited a ball of slime at Mermaid Man. Mermaid Man jumped out of the way and the slimeball blasted Atomic Flounder instead. The slimeball was so sticky that it immobilized Atomic Flounder and stuck him to the ground.

Mermaid Man used The Bronze Hairnet's hairnet to capture all of the BGATFBC members and make them talk. They said that "BGATFBC" stood for "Bad Guys All Together For Book Club" and that they couldn't imprison them for reading. Mermaid Man said that this was right and let them continue their book club.

Powers and Abilities

  • Slimeballs - Sinister Slug can vomit slimeballs at people. When struck by the slimeballs, the target becomes immobilized and incapacitated, as the sticky slime leads to them becoming stuck to the floor.
  • Climbing - Sinister Slug is sticky enough to climb up the walls.





           SpongeBob.png Villains

Main Villains
Mr. Krabs | Plankton | Karen Plankton | Mrs. Puff

Major Villains
Flying Dutchman | Man Ray | Sinister Slug | Jumbo Shrimp | Atomic Flounder | Dirty Bubble | Bubble Bass | Plankton Family | DoodleBob

Movie Villains
The SpongeBob Squarepants Movie:
Mr. Krabs | Mrs. Puff | Plankton | Dennis | Karen Plankton | Victor | Cyclops | Boat Jacker | The Thug Tug Gang
The SpongeBob Movie: Sponge Out of Water:
Plankton | Mr. Krabs | Burger-Beard
The SpongeBob Movie: Sponge On the Run:
Plankton | Mr. Krabs | Karen Plankton | King Poseidon | El Diablo

Super Villains
The Moth | Catfishstress | Octopus King | Hoodoo Guru | Robot Mantis

Alaskan Bull Worm | Puffy Fluffy | Big One | BlackJack SquarePants | Sea Bear | Evil Alien Jellion Overlord | Dragon Jellyfish | The Jellions | Jelliens | Kraken | Krabby Patty Zombies

Evil Organizations
Every Villain Is Lemons | Evil Syndicate

Sergeant Sam Roderick | Tattletale Strangler | Howard Blandy | Carl | Con Man | Master Udon | Don Grouper | Animatronic Hieronymus Glove | Madame Hagfish | Art Appraiser | Miss Gretel Puss | Flats the Flounder | Gale Doppler | Stickyfins Whiting | Dorsal Dan

The Fisherman | Hash-Slinging Slasher | Count Orlok

Abrasive SpongeBob | Dead-Eye Plankton | Planktonamor | Dreaded Patrick | Karen 2.0 | Captain Scarfish | ToyBob | Mini Doodles | Plankrab | Doctor Negative | Alternate Reality Mr. Krabs

Lord Poltergeist | Gordon


Video-Game Villains
King Gorge | The Mawgu | SpongeBot SteelPants | Robot Plankton | Robots | Globulous Maximus | Seymour Scales

Other Animals
Triton | Cuddle E. Hugs | Swamp Natives | Earworm