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- Dr. Rick Spartan (first appearance)(main story and flashback)
- Cachinga (first appearance)(main story and flashback)
- Angie Dinkley
- Sheriff Bronson Stone
- Headless Horror (single appearance)(main story and flashback)(disguise)/
- Marion Spartan (single appearance)(main story and flashback)(redeemed)
- Miscellaneous students (no lines)
- Dr. Thistle
- Amazon jungle
- Crystal Cove
- The Mystery Machine
- Police car
|Charles "Cachinga" Wheatlesby||He is annoyed about the way he's treated and his nickname.|
|Marion Spartan as the Headless Horror||To scare her husband out of adventuring so she could live a normal life.|
- It seems that Velma is now over Shaggy from their break-up in Battle of the Humungonauts; Shaggy is not so over Velma.
- Running gag: Dr. Spartan asking the gang if they want to do something, Fred saying yes, and the rest of them say, "not really."
- Dr. Rick Spartan is based on Indiana Jones. Maybe a little Doc Savage, too.
Inconsistencies/continuity errors and/or goofs/oddities
- When Rick is telling about his fight with the Headless Horror, he says he kicked it right in the face. HEADLESS creatures have no face. However, it has a sort of "face" on its torso.
- For a single shot after Marion's flashback, Rick has a red scarf around his neck, similar to that of his wife.
- Rick Spartan is credited as "Nick Spartan," and the Headless Horror is credited as the "Headless Creature."
In other languages
|Italian||Attacco Del Mostro Senza Testa||Attack Of The Headless Monster|
|Greek||Η Επίθεση του Ακέφαλου Τρόμου||The Attack of the Headless Horror|
- Scooby-Doo! Mystery Incorporated: Season One, Part 2 - Crystal Cove Curse DVD set released by Warner Home Video on January 24, 2012.
- Scooby-Doo! Mystery Incorporated: The Complete Season 1 DVD set released by Warner Home Video on October 8, 2013.
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|Menace of the Manticore|| Scooby-Doo! Mystery Incorporated|
|A Haunting in Crystal Cove|