What begins as a routine night for the gang hanging out in their treehouse turns mysterious when Scooby discovers a treasure map in his triple extra-large Scooby Snack pizza. The treasure map is said to lead to the treasure of villainous scallywag Gnarlybeard the Pirate. The gang make a mad dash to find the frightening Ye Phantom Parrot with the stolen map, where Scooby sniffs out the map's clues, leading him right to a spooky pirate ship. What will Gnarlybeard be willing to do to protect his booty?
Tropes provided:
- Adapted Out: Red Herring goes unblamed by Fred, and unmentioned, in this film.
- Big, Stupid Doodoo-Head: Gnarlybeard responds to Scooby and Shaggy flying away from the plank by calling them "poopyheads".
- Captain Colorbeard: The main monster of the film is Gnarlybeard the Pirate.
- Cast as a Mask: Gnarlybeard is voiced by John Rhys-Davies, with Stephanie D'Abruzzo voicing his true identity as Shirley Stukowski.
- Evil Smells Bad: Gnarlybeard the Pirate gets his name from the fact that his beard stinks so bad due to never washing it.
- The Man in the Mirror Talks Back: Freddy and his reflection have a conversation early in the film.
- Mythology Gag: Except for Shaggy's, Freddy's, and Daphne's eyes, the gang based on how they looked (clothes and hairstyle) in A Pup Named Scooby-Doo, it even has the sound effect each time Velma walks as well as them hanging out in a treehouse
◊ vaguely similar in design, except here there are some flowers added and darker stripes on the façade.- Scooby undergoing a transformation when he eats a Scooby Snack is what happened in Shaggy & Scooby-Doo Get A Clue!.
- Which is probably itself a Mythology Gag to A Pup Named Scooby Doo. He'd regually turn into a rocket and blast off before exploding into fireworks and floating back down. (It's even in the opening credits!)
- Scooby undergoing a transformation when he eats a Scooby Snack is what happened in Shaggy & Scooby-Doo Get A Clue!.
- Pilot Movie: The film was apparently intended to serve as a pilot for a Scooby-Doo puppet show television series.
- Pirate Parrot: Gnarlybeard is said to have a pet parrot known as Ye Phantom Parrot. The one the gang confronts turns out to be pizza delivery boy Stu Stukowski in a disguise.
- Puppet Shows: Yep, the first puppet show in the franchise to be precise.
- Recycled Soundtrack: All the songs are recycled from other Scooby movies (The opening song from Scooby-Doo! Abracadabra-Doo, "Dig It, Scooby-Doo" from Scooby-Doo! Legend of the Phantosaur, and "Here Comes Summer" from Scooby-Doo: Camp Scare).
- "Scooby-Doo" Hoax: Ye Phantom Parrot is really Stu Stukowski, and the Ghost of Gnarlybeard is actually Stu's sister Shirley.
- Significant Double Casting: Dee Bradley Baker voices Stu the pizza delivery boy and the Phantom Parrot. The former disguised himself as the latter.
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Spiritual Successor: The film is in spirit a continuation of A Pup Named Scooby-Doo, even having the puppets look similar to how the gang were depicted in that cartoon. - Treehouse of Fun: The story starts at a treehouse.
- Unconventional Food Order: Shaggy orders a triple extra-large pizza with peanut butter, pickles, potato chips and even Scooby Snacks.
- Villainous Legacy: Stu and Shirley Stukowski are after Gnarlybeard's treasure because they believe themselves to be Gnarlybeard's descendants.
- Vocal Dissonance: The gang are dressed like how they looked when they were in grade school but are voiced by their current voice actors (Frank Welker, Grey DeLisle, Matt Lillard) as if they’re still older teens if not young adults.
