History WesternAnimation / ScoobyDooOnZombieIsland

* ActorAllusion: Creator/AdrienneBarbeau voices Simone Lenoir, who has several cats [[spoiler:and turns out to be a cat-monster herself.]] Barbeau's best-known animated role is ComicBook/{{Catwoman}} from ''WesternAnimation/BatmanTheAnimatedSeries''. Also, as with ''Film/SwampThing'', Barbeau's character is involved with strange things in the Louisiana swamps.

* BlazingInfernoHellfireSauce: Moonscar Island's peppers are shown to be this and are way too spicy even for Shaggy and Scooby to handle.

* DefrostingIceQueen: Simone is very cold to the gang at first, coming across as a bit snooty, and unhappy that they were invited out by Lena, but (aside from her annoyance at Scooby) gets warmer, laughing approvingly after Shaggy and Scooby have the hot peppers, and telling the gang to call her by her first name and showing interest in their investigation. [[spoiler:It's all an act though as she is not only planning to sacrifice them to maintain their immortality and is even more scornful to the gang after the reveal]].

* AntiVillain: [[spoiler:Simone and Lena turn out to be werecats who drain life from others due to the fact that they were cursed as part of a ritual to get revenge on those who slaughtered their townspeople.]]

* BigBadDuumvirate: [[spoiler:Simone and Lena are the true villains of the film, since Jacques is subservient to them, though to a nominal degree in Lena's case]].

* BigBad: [[spoiler:Simone is the main villain of the film, since Lena and Jacques are subservient to her, though to a nominal degree in Lena's case]].

* TheDragon: [[spoiler:Lena is Simone's top lackey]].

** Morgan Moonscar is built up as the main antagonist, especially after his ghost carves a warning into Simone's kitchen wall. [[spoiler:Only he's the GreaterScopeVillain who's pulled a HeelFaceTurn in death, and was the first victim of Simone, the ''true'' BigBad]].

* TheCatfish: Snakebite Scruggs, a minor character fisherman introduced at the beginning, is constantly trying to catch a massive catfish named "Big Mona". Big Mona sprays Scooby's face with water and is a large, mean fish.

* AndIMustScream: [[spoiler: The existence of the zombies. They were once normal people who had their life force drained by the cat people. Consequently this turned them into aware but immortal zombie monsters.]]

* CatsHaveNineLives: As pointed out by Velma [[spoiler:when the cat creatures' fail to drain the gang's lives in time.]]

* CelestialDeadline: [[spoiler: The cat creatures have to drain visitors' life forces every midnight on a harvest moon so they can live forever.]]
* CerebusSyndrome: Mystery Inc.'s wacky pursuits of real monsters always turn out to be criminals and con artists in disguise. Then things take a dark turn when [[spoiler: the zombies of Moonscar Island turn out to be the ''real deal'']].

* ClothingDamage: Actually a minor plot point. [[spoiler: Lena and Simone transforming into cat creatures]] results in their clothes ripping. Velma is then able to [[spoiler: use some of the clothing fragments to change the voodoo dolls so they now target Simone and Lena]].

* DarkAndTroubledPast: [[spoiler: Simone and Lena were part of a group of settlers who were devoted to a cat god, until Morgan Moonscar and his pirates showed up, and chased the settlers into the water where they were eaten by alligators. Simone and Lena, the only two survivors, prayed to the cat god for revenge against the pirates. The cat god responded by transforming the two of them into cat creatures with the power to destroy Moonscar and his crew. Unfortunately, this blessing came with a curse of its own, requiring them to drain people's life forces every harvest moon to preserve their immortality.]]

** Also the usual formula is the gang finding that the local MonsterOfTheWeek is just a guy in a mask with very rare exceptions of them being real- trying to keep others away from their property so they can get rich/revenge/etc. to move on from their perceived grievances. In this case, the real monsters [[spoiler: invert this by having the monsters disguising themselves as humans after discarding their humanity long ago in order to ensnare victims into their property to keep them forever and have long since discarded their grudges for the sake of longevity and sadism- becoming more monstrous than the people that they sought vengeance against in the first place]].

* EmergingFromTheShadows: Lena is introduced coming out of the shadows. Simone later does this [[spoiler: when the gang finds her in the voodoo chamber and her and Lena's true colors are revealed.]]
* EvenEvilHasStandards: Morgan Moonscar and his pirates were brutal killers in life, [[spoiler: but even in their undead state, they try to scare people away from the area so innocents don't suffer the same fate as they did.]]

* FairCop: [[spoiler: Beau turns out to be an undercover cop]], and Daphne takes the time to talk about his attractiveness.

* FateWorseThanDeath: [[spoiler: The zombies. They were drained of their life by the werecats but remain trapped in limbo as fully aware undead with no way to pass on to the afterlife and no way to properly communicate with the living other than their moans due to how badly decayed their bodies are.]]

* FromBadToWorse: In the climax of the movie, [[spoiler:the Gang not only discovers that the zombies they've been encountering are ''real'', but the island is swarming with them. Then it's revealed that Leona, Simone, and Jacques are immortal cat creatures and the zombies were actual their victims]].

* GaveUpTooSoon: As revealed by Shaggy and Scooby knocking some dirt off the side, the skeleton of one zombie is in the pit Beau dug, just a few inches from being exposed. [[spoiler: The reveal that he was actively searching for dead bodies due to investigating the disappearances when he dug that pit makes this even more pronounced]].

** [[spoiler: The zombies themselves. Morgan Moonscar is initially built up as the BigBad and the other zombies are thought to be murderous monsters. Of course, it turns out they're the victims of Simone, Lena, and Jacques, and are simply trying to save others from suffering their fate. Daphne lampshades this when the zombies get Shaggy and Scooby away from the cat monsters, though Shaggy has a hard time believing her.]]

* HairstyleInertia: [[spoiler: Lena keeps her hair the same way in the present as she did two hundred years ago, complete with a headband. Simone by contrast had long hair in the past but wears it short now]].

* KarmicDeath: [[spoiler: Simone, Lena, and Jacques are killed by the very curse they possess when they are unable to drain the lives of Mystery Inc. in time to survive the harvest moon]].

** [[spoiler: Lena, and Jascque]] are this as well, acting as jovial and concerned samaritans when in reality they're smug, sociopathic, and sadistic monsters. [[spoiler: Simone]] to a lesser extent, with a cold aloof yet caring personality that hides the sadistic and scornful nature- with the aloofness implied to be her not quite acting right and her true nature showing through.

* MonochromePast: [[spoiler: Simone's tragic backstory is depicted with old-fashioned sepia tone.]]

* NeverSayDie: Zigzagged. Scooby and Shaggy repeatedly refer to the zombies as being "dead," but [[spoiler: Simone points out during her tragic backstory that she and Lena "destroyed" the pirates upon granting their curse from the cat god]]. Although in the latter case, regular old death [[FateWorseThanDeath would have been preferable.]]

* NightmareFace: [[spoiler: Simone gives a terrifying face to the camera when she partially undergoes her werecat transformation and again with Lena when they fully transform.]]

** Beau, the gardener, seems like a shady guy and always gets annoyed when his flowerbeds are ruined. [[spoiler: However, he's really an undercover police officer investigating the disappearances of missing tourists who ultimately learns the truth.]]
** [[spoiler: The zombies so very much. Yes, they're quite terrifying and they know it. That's the point. They're not trying to hurt or eat Scooby and his friends. They're trying to ''save'' them from being consumed by Simone and Lena.]]

* OhCrap: Several characters have horrified reactions to realizing they're screwed several times throughout the film. One in particular that stands out is Fred when he finally gets it that the zombies really are real, and really are trying to kill them [[spoiler: ...Or not. The zombies are actually trying to scare them away, so the ''real'' villains won't sacrifice them to their cat god.]]

* OneManArmy: [[spoiler: Simone and Lena, and by extension possible Jacques are implied to be this, considering the former two butchered Morgan Moonscar's entire crew as well as destroyed a presumably much better-armed Confederate army regiment.]]

* OurZombiesAreDifferent: ''Very'' different. Not the [[Film/NightOfTheLivingDead1968 flesh eating kind]] or the [[Film/ReturnOfTheLivingDead brain eating kind]]. [[spoiler: Or the evil kind. They're the completely sentient victims of the soul stealing magical cat people, so they want only to try and scare humans away, so they don't join their ranks. Also, they only seem to be active for a short time before the cat people's "feeding time," and initially manifest as ''ghosts;'' it's only when the chosen night descends that they can physically manifest as zombies.]]

** When Scooby gets trapped in quicksand, a Confederate zombie passes Shaggy a vine to help pull him out. [[spoiler: Then it turns out that they're not actually evil.]]
** [[spoiler: Lena]] expresses genuine concern for [[spoiler: Jacques]] when [[spoiler: she]] hears [[spoiler: him]] being attacked.

* PreMortemOneLiner: Velma says "Looks like your nine lives are up!" [[spoiler: when midnight has passed and the cat creatures have failed to drain the gang's life forces before then, ending the curse and causing them to be destroyed.]]

** Beau seems pretty suspicious and is pretty hostile to the gang. [[spoiler: He turns out to be an undercover cop investigating the disappearances on Moonscar Island and becomes the SixthRanger to the group.]]

** Morgan Moonscar is built up as the main antagonist, especially after his ghost carves a warning into Simone's kitchen wall. [[spoiler: Only he's the GreaterScopeVillain who's pulled a HeelFaceTurn in death, and was the first victim of Simone, the ''true'' BigBad]].

* RevengeBeforeReason: [[spoiler: Lena and Simone focus their attention on draining Shaggy and Scooby after the two hinder their ceremony on top of all the trouble they caused throughout the movie, rather than draining Velma, Daphne, Fred, and Beau, who are still restained. This decision buys the four enough time to escape and intervene, costing the villains their lives.]]

* RomanticFalseLead: Daphne and Fred develop crushes on Beau and Lena, respectively, invoking each other's jealousy. This leads to nowhere as the former [[spoiler: is an undercover detective with more things on his mind than romance and the latter brought the gang including Fred to the island in order to drag them- seeing them as food from the start]].

** [[spoiler: While the werecats are draining a victim's life force, as shown when Simone and Lena attempt to do this to Shaggy and Scooby, they and their victims glow an unhealthy green as the victims [[RapidAging rapidly age.]]]]

** Sure, she would lose them in the next few movies, but ''Daphne.'' Now she's an investigative reporter, determined to find a genuine supernatural event. [[spoiler: She goes toe to toe with three werecats, and helps stop them]], becoming a DamselOutOfDistress in the process.

* TransformationSequence: [[spoiler: Simone and Lena have one as they transform into werecats and prepare to drain the gang's life forces.]]

* UnwittingInstigatorOfDoom: [[spoiler: Despite not being the main villain, Morgan Moonscar and his pirate crew are the reason why the movie even happens in the first place; When they raided the island two centuries ago and had most of the islanders eaten by alligators. As a result, the two surviving settlers, Simone and Lena, prayed to their cat god for a chance to get revenge, and they were transformed into life-draining cat creatures that ended up draining them of their life force, and then the life force of several innocent victims simply to stay alive after, turning all of them into zombies.]]

* HoistByTheirOwnPetard: Scooby uses one of Moonscar Island's own chili peppers to blind [[spoiler:Jacques]] and Velma and Daphne turn [[spoiler:Simone and Lena's love of dolls against them by using their own dolls with their likenesses]].