This is a list of monsters and villains from Scooby-Doo! Mystery Incorporated.

Season one

• Slime Mutant - Professor Emmanuel Raffalo (Episode 1)
• Creeping Creatures - Grady Gator, Greta Gator, and Gunther Gator (Episode 2)
• Ghost Truck - Rung Ladderton/Ghost Truck-Driver (Episode 3)
• Man-Crab - Bud Shelton (Episode 4)
• Que Horiffico - Mary Anne Gleardan (Episode 5)
• Ghost Girl - Alice May (Episode 6)
• Phantom - Daniel Prezette (Fantzee Pantz) (Epispde 7)
• Gnome - Gill Littlefoot (Episode 8)
• Red Humungonaut - Jax Minner/Green Humungonaut - Max Minner (Episode 9)
• Fright Hound - operated by Mrs. Wyatt (Episode 10)
• Vampire - Sheila Altoonian (Episode 11)
• Char Gar Gothakon - Howard E. Roberts (Episdoe 12)
• Cicada Creature - Grandma Moonbeam (Episode 13)
• Lord Infernicus - Jonathan Wellington Muddlemore (nicknamed Funky Phantom) (Episode 14)
• Shadowy Orc - Maxwell (Episode 15)
• Aphrodite - Amanda Smythe (Episode 16)
• Demented speaker - Danny Darrow (Episdoe 17)
• White Wizard - Mr. Wang (Episode 18)
• Nightfright - Argus Fentonpoof (Episode 19)
• Fish Freaks - Ernesto and his group of activists (Episode 20)
• Manticore - Hot Dog Water (Episode 21)
• Headless Creature - Marion Spartan (Episode 22)
• Shadowy Figure - Professor Pericles (Episode 23)
• Ghost of Dead Justice - Deputy Bucky (Episode 24)
• Obliteratrix - Alice May (Episode 25)
• Freak of Crystal Cove - Mayor Fred Jones, Sr. (Episode 26)

*Parents of Mystery Incorporated. Not monsters, but they become antagonists as the series progresses: Nan and Barty Blake, Angie and Dale Dinkley, Paula and Colton Rogers, and also Sheriff Bronson Stone.

Season two

• Crybaby Clown (Episode 27)
• Baba Yaga - Curator Vronsky (Episode 28)
• Crybaby Clown - Baylor Hotner (Episode 29)
• Dreamweaver - Horbert Feist (Episode 30)
• Hodag of Horror - Roberto, the trained pet monkey of Ned Fussbuster (Episode 31)
• Junk - Butch Firbanks (Episode 32)
• Graveyard Ghoul - Count Evallo von Meanskrieg (Episode 33)
• Dark Lillith - Hot Dog Water (Episode 34)
• Hebediah Grim - Gary and Ethan (Episode 35)
• Fiend - Dan Fluunk (Episode 36)
• Robots - Professor Pericles (Episode 37)
• Scarebear - Benson Fuhrman (Episode 38)
• Krampus - Charlie the Hanted Robot, controlled by Jason Wyatt for Mystery Inc. (Episode 39)
• Dragon - Jenny Zin (Episode 40)
• Mummy of Friar Sera - George Avocados (Episode 41)

See also

• List of monsters and villains