Gill-man is a sea monster, also known as the Creature from the Black Lagoon.
- Gill-man: A differently designed purple version of the gill-man appears in as one of Lorne Chumley's costumes. (TNSDMovies: The Exterminator)
- Gill-man: In the opening theme song of The New Scooby-Doo Mysteries, the gill-man can be seen dancing with Frankenstein, Igor, Dracula, Wolfman, and Medusa. He went onto appear in the the first episode, Happy Birthday, Scooby-Doo, where gill-man was in a home video of Scooby and Shaggy as babies, where he pops out of a water fountain they were playing in. He then was next featured as one of the monster guests at Dracula's party, in A Halloween Hassle at Dracula's Castle. It's unknown if these two creatures are one and the same.
- Gill-man: The gill-man took his daughter to Miss Grimwood's Finishing School for Ghouls as a new student, but the sight of her (and the other new students) scarred off Scooby-Doo and Shaggy Rogers, who had had enough. (Scooby-Doo and the Ghoul School)