The twelfth ''WesternAnimation/ScoobyDoo'' direct-to-video animated film produced by [[Creator/WarnerBros Warner Bros. Animation]], ''Scooby-Doo and the Goblin King'' is the first of films produced without [[Creator/HannaBarbera William Hanna and Joseph Barbera]].

This movie takes elements from ''[[WesternAnimation/ScoobyDooOnZombieIsland Zombie Island]]'', ''[[WesternAnimation/ScoobyDooAndTheWitchsGhost Witch’s Ghost]]'', ''[[WesternAnimation/ScoobyDooAndTheAlienInvaders Alien Invaders]]'' as well as ''[[WesternAnimation/ScoobyDooAndTheCyberChase Cyber Chase]]'' by [[spoiler:having supernatural elements in the story as real]]. The movie’s significant in showing Shaggy and Scooby as main characters, something not seen since ''WesternAnimation/ScoobyDooAndTheGhoulSchool'', ''WesternAnimation/ScoobyDooMeetsTheBooBrothers'' and ''WesternAnimation/ScoobyDooAndTheReluctantWerewolf'', though not sure about ''WesternAnimation/ScoobyDooInArabianNights''. Though the film is a bit more light-hearted, it’s the fifth as well as the second to last What's New Scooby Doo? movie.

It's Halloween night, and the gang has decided to visit a Halloween carnival. However, when a magician, "The Amazing Krudsky", does not allow Scooby into his show, Shaggy and Scooby both decide to expose him as a fraud. After Shaggy and Scooby succeed in ruining his show, [[spoiler:Krudsky]] returns to his dressing room, where a fairy, Princess Willow, inadvertently causes him to discover an entry on the Goblin Scepter in a spell book. She decides to toy with him, but he eventually discovers her, and drains her magic so he can become a real magician.\\
Shaggy and Scooby, after trick-or-treating all night, persuade the gang to let them hit one more house. When they arrive, they meet Mr. Gibbles, who tells them that the building is actually a genuine magic shop, and that magic exists. However, Princess Willow flies in at that moment, being chased down by [[spoiler:Krudsky]]. He captures her, turns Gibbles into a rabbit and steals all the magical equipment before he leaves. Gibbles then explains to Shaggy and Scooby that the only way for [[spoiler:Krudsky]] to be stopped is for them to enter the world of magic via Grim Reaper Railway and retrieve the Goblin Scepter before [[spoiler:Krudsky]] does. But if they don't make it back before sunrise, then they'll be trapped in the magic world forever.

!! The film provides examples of the following Tropes:

* AfterlifeExpress: The Grim Reaper Railway.
* BalefulPolymorph: This is Krudsky's major form of attack once he gains magical powers. He turns Gribbles into a rabbit, Velma into a werewolf, Fred into a vampire, Daphne into a witch and [[spoiler:the Goblin King]] into a goose. Additionally, Shaggy and Scooby are turned into a snail and a mouse by the witches in the Dead Bogs.
* BigEater: Shaggy and Scooby, as usual. Of course, they're trick-or-treating.
* TheCameo: There's a bunch of Scrappy Dolls, that get innocently run over by a monstrous hijacked mystery machine (hmmmm) and Krudsy flips through a picture of Fangface.
* ContinuityPorn: When Shaggy and Scooby are in the tavern, you can spot many of the monsters they encountered in previous series.
* CoversAlwaysLie [[spoiler: [[Creator/TimCurry The Goblin King]] is [[DarkIsNotEvil actually the good guy]] instead of the BigBad as people may believe when looking at the cover]].
* DarkerAndEdgier
* DarkIsNotEvil: As it turns out, [[spoiler:the Goblin King really isn't a bad guy. In fact, he's ''Willow's father'']].
* DemotedToExtra: Fred, Daphne and Velma. As is with the late-2000s direct-to-video ''Scooby-Doo'' movies, the three play a much smaller role than they usually do; the movie primarily focuses on Scooby-Doo and Shaggy.
* DisproportionateRetribution: Sure he acted a bit rude about it, but Shaggy and Scooby ruining Krudsky's magic show and career just because he didn't allow dogs in to watch his show went more than a little overboard when it came to payback. To be fair though, this does cause them and the rest of the gang to get kicked out of the carnival.
* DistressedDude: After [[spoiler:making it to the castle of the Goblin King and sneaking in, Shaggy and Scooby blow their disguises, and are immediately sent to a tower in chains]].
* DramaticThunder: When Mr. Gibbles makes his entrance at his magic shop house, with some really ''LOUD'' and real-sounding thunder.
* TheDreaded: The Goblin King, to the point where the other monsters in the tavern flee in fear when Shaggy asks for directions to the king's castle.
* FlyingBroomstick: The witches loan Scooby and Shaggy a flying broomstick to use as transportation in the Goblin Kingdom.
* {{Foreshadowing}}: [[spoiler: Remember the part when Daphne, Fred and Velma look through the cutout board of a witch, vampire and werewolf at the beginning of the movie? Yeah, guess what they temporarily turn into respectively later in the film.]]
* FunctionalMagic
* HeadlessHorseman: Shaggy and Scooby are chased by one once in the world of magic.
* TheHecateSisters: The witches.
* HeroicBSOD: Once [[spoiler:Krudsky]] obtains real magic power, Velma's logical brain shuts down.
* [[spoiler: HeroicSacrifice: Jack O'Lantern. Don't worry, he [[BackFromTheDead gets]] better.]]
* HotWitch: The Cat Witch (as she is identified in the credits).
* {{Irony}}: Shaggy and Scooby are ''not'' afraid of Halloween, despite the fact that they get freaked out by guys in costumes every single day of the week.
** They have good explanation though, they know everyone is in costume and the point of the holiday is meant to be fun. So there's no reason to be scared (least by no one with malicious intent). Plus, y'know, free candy.
* ItOnlyWorksOnce: The magic cards Mr. Gibbles gives Shaggy and Scooby can only be used once, and their effects only last a short time.
* LaserGuidedAmnesia: [[spoiler: The Goblin King erases the events of the night from Fred, Daphne and Velma's minds. Shaggy and Scooby are allowed to keep their memories, though, as a reward for proving their courage.]]
* LiteralMetaphor: Shaggy and Scooby gain magic potion made from scratch. Cue the scene shifting to one of the witches on a tombstone that reads "Here lies Scratch" and giving a wicked laugh.
* MagiciansAreWizards: Krudsky drains Princess Willow's magic to grant himself real magic powers.
* ManIFeelLikeAWoman: To get inside, Shaggy and Scooby drink a magic potion end up dressing like Daphne and Velma, respectively. This actually isn't the first film where they do it.
* MonsterMash
* MythologyGag: Mr. Gibbles conjures the Black Knight Ghost during his song.
** Some of the real monsters resemble the fake ones from the original series, like the Creeper.
* NeverMyFault: Both Shaggy and Scooby don't want to take the blame that their sabotaging Krudsky's show led to his villainous plot.
* OutOfFocus: Fred, Daphne and Velma are in the story but play a bit role at best. This is all Shaggy and Scooby.
* PapaWolf: [[spoiler:The Goblin towards his daughter Willow.]]
* PumpkinPerson: Jack O'Lantern, a sentient pumpkin, is worn as the head of the HeadlessHorseman. He's not exactly pleased with the ordeal.
* SanitySlippage: Velma goes temporarily insane when she sees a real live fairy.
* ScoobyDooHoax: Surprisingly averted.
* SkeletalMusician: The band in the monster bar that Scooby and Shaggy stumble into while searching for the Goblin King's castle are skeletons.
* TookALevelInJerkass: Scooby and Shaggy ruin Krudsky's act and don't even apologize.
** Though Krudsky was being a jerkass to them first (he wouldn't let Scooby in). And it seems to imply that Krudsky is a JerkassWoobie.
* VineSwing: Scooby does this to save Shaggy from the HeadlessHorseman when he is being chased through the swamp.
* WhereTheyWere: How it ends.