|This needs a stretch.|
The "Fiend" was the disguise of Dan Fluunk.
It was a purple cloaked figure with a green Anubis mask. While people were under the influence of the Terrorwood's hallucinogenic fumes, they would often see him as a werewolf-like monster.
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Powers and abilities
He has none, he just uses terror wood to make hallucinations.
Scooby-Doo! Mystery Incorporated
He lived in the Burlington Library his entire live and was even born there, so he used the disguise to scare people away so it would be closed and he could leave. When he was caught and taken away by the police, he was insanely happy because he got to leave that cold library.
- This was the first monster of Scooby-Doo! Mystery Incorporated not to have an in-show name, it's only identified as "Fiend" from the credits.