[[caption-width-right:332:[[{{Tagline}} This time, the monsters are real...]]]]

->''All the trees begin to moan'' \\
''And the monsters grunt and groan'' \\
''Rotting faces full of slime'' \\
''Don't you know it's terror time?'' \\
''And it's terror time again'' \\
''They've got you running through the night'' \\
''Yes, it's terror time again'' \\
''Oh, you just might die of fright!'' \\
''It's a terrifying time!''

The year is 1997. Most people would have figured the ''Franchise/ScoobyDoo'' franchise had pretty much [[JumpingTheShark run its course]]. It had been 6 years since ''WesternAnimation/APupNamedScoobyDoo'' was cancelled, the only sign of life in the franchise being a made-for-TV-movie in 1994 called ''WesternAnimation/ScoobyDooInArabianNights'' in which Scooby barely appeared, and the ever-present reruns of exploits from decades past.

Then, out of nowhere, came something totally unexpected. Children and parents everywhere stared in amazement at one thing: a trailer on VHS tapes of several Creator/WarnerBros family films...

The trailer had sleek animation, dark colors, and featured a seemingly truly dark and potentially scary movie... and it featured Scooby-Doo and Shaggy running for their lives. The title; ''Scooby-Doo on Zombie Island''. The tagline; ''This time, the monsters are real''. It was short, but it was enough to send kids everywhere into a furor.

Cut to 1998. Parents and kids grab the video off of video and rental stores' shelves. They're expecting something fun, nothing more dangerous than the average ''Scooby'' mystery. To their horror-filled delight, the latter assumption turned out wrong.

With a warmly-received journey into relatively mature writing (partially helped by being a DolledUpInstallment, see below), ''Zombie Island'' marked a – or, in some peoples' opinions, ''the'' – high point in the ''Scooby-Doo'' franchise. The film, as mentioned before, is beautifully animated – more so than any incarnation before and still unmatched today – with a literally dark and realistic feel to it. On top of that, it featured a somewhat cynical/mature look at what happened to Mystery Inc. after their adventures were done, which would be touched on again in TheMovie, but with less success. Characters were more fleshed out and three-dimensional, especially the newly empowered Daphne. The irrelevant pop songs of past cartoons gave way to Alternative and Metal music. The story appealed to older viewers with honest-to-goodness death as part of the backstory, and the end result for the gang if they didn't win.[[note]] [[TrailersAlwaysSpoil Although the back cover mentioned that they]] ''[[TrailersAlwaysSpoil do]]'' [[TrailersAlwaysSpoil make it out alive.]] [[/note]] And the best part of it all? No contrived story with a guy in a mask... just like the ads promised, [[PunctuatedForEmphasis they were Real. Stinkin'. Zombies]]. Probably the only complaint the movie generated was, "[[AnimationAgeGhetto it's too scary for young]] ''[[AnimationAgeGhetto Scooby]]'' [[AnimationAgeGhetto fans]]."

The success of ''Zombie Island'' led to the creation of three more direct-to-video movies covering mysteries Scooby and the gang would solve as adults, starting with ''WesternAnimation/ScoobyDooAndTheWitchsGhost''. The success of ''those'' caused a wholesale revival of the franchise, culminating in [[Film/ScoobyDoo a live-action film]] and the first new TV series in over a decade, ''WesternAnimation/WhatsNewScoobyDoo'' (with more series to follow). The Direct-to-Video movies would also continue, even if the animation quality was not often up to the high standards set by ''Zombie Island''.

Production started at Creator/HannaBarbera, but it was completed by its then-new parent company, [[Creator/WarnerBros Warner Bros. Animation]] after the buyout. WB has produced all subsequent ''Scooby-Doo'' films.

The movie starts with Fred inviting Daphne, Scooby, Shaggy, and Velma to a long-awaited Mystery Inc. reunion, held in honor of Daphne’s birthday. The five of them travel to UsefulNotes/NewOrleans in order to find real monsters to discuss on Daphne's talk show. After effortlessly exposing several creature impostors, the gang accepts an offer to visit Moonscar Island. The island is home to a French chili pepper plantation owner named Simone Lenoir, and has become the site of several disappearances over the years. While there, our heroes grapple with zombies and voodoo, death becomes a real threat, and the adventure grows legitimately dark and scary.

''Zombie Island'' is also notable for having the first permanent [[TheOtherDarrin shakeup of the franchise's vocal cast]].[[labelnote:±]] Prior to this, the only main character to have been permanently recast since ''Where Are You'' ended in 1970 had been Velma (although ''WesternAnimation/APupNamedScoobyDoo'', being a SpinoffBabies series, necessarily replaced the entire voice cast except for Shaggy and Scooby).[[/labelnote]] Creator/DonMessick, Scooby-Doo's long-time voice, retired in 1996 and died in 1997 shortly before recording could begin – the movie is dedicated to his memory; Scooby himself is played by Scott Innes instead. Creator/CaseyKasem, who had played Shaggy in every incarnation of the franchise up to this point, declined to reprise his role here after refusing to voice the character in a Burger King commercial (though he would return four years later after he successfully fought for the character to be a vegetarian), so Shaggy is played – for the first and only time – by Creator/BillyWest[[labelnote:±]] though Billy did voice the BigEater one additional time in a Creator/KidsWB commercial[[/labelnote]]. Daphne and Velma are played here by Creator/MaryKayBergman and Creator/BJWard respectively, replacing original VA's Heather North and Nicole Jaffe (also respectively; both original voices would briefly return four years later). Creator/FrankWelker, reprising his role of Fred, was the only original cast member to return.
!!This film provides examples of the following {{Tropes}}:

* AgentScully: Fred takes his sweet time accepting the possibility that ''real'' zombies and ghosts are pursuing them.
* AmbiguouslyEvil: [[spoiler:The GreaterScopeVillain "cat god." On one hand, he seemed benevolent and generous toward Lena and Simone's settler group... but on the other hand, when the two asked him for {{Revenge}} on Moonscar's crew, his response was to turn them into LifeDrain-ing werecats and withhold the [[PowerAtAPrice Price]] from them until after the fact.]]
* 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.]]
* 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.]] Both [[SlidingScaleOfAntiVillains Type II]].
* AssholeVictim: [[spoiler:It's hard to feel sorry for Morgan Moonscar and his crew being turned into zombies after the horrible things they did]].
* TheAtoner: [[spoiler:Morgan Moonscar and his pirate crew, Simone and Lena's first victims, and the only ones who were ''not'' innocent. In life, they were savage killers who slaughtered an entire colony of innocent settlers for no good reason, but in undeath, they are apparently remorseful for their actions, and have done a HeelFaceTurn in trying to save others from being killed by the werecats.]]
* BalloonBelly: Scooby and Shaggy after eating a ton of contraband food (or more likely just food they've been stealing from people).
* BeCarefulWhatYouWishFor: [[spoiler:Simone and her servant Lena prayed to cat gods for the power to protect their island from pirates. The gods granted them such power, but also cursed them to drain the lives of others during the harvest moon]].
** One could also argue that Scooby and the gang suffered this trope after Daphne expressed desires to meet real monsters.
* BigBad: [[spoiler:Simone, since Lena and Jacques are subservient to her, though to a nominal degree in Lena's case]].
* BigDamnMovie: The first movie, in fact.
* BigEater: Scooby and Shaggy as usual.
* BirthdayEpisode: The Mystery Inc. reunion begins on Daphne's birthday. Ironically, she gets so caught up in her work beforehand, that she loses track of her birthday until everyone else greets her.
* BitchInSheepsClothing: [[spoiler: Simone, Lena, and Jacques all start out the film as decent and friendly people, especially the jovial Jacques. Then they reveal themselves to be werecats who have been murdering people ''en masse'' for centuries.]]
* TheBrute: [[spoiler:Jacques turns out to be in league with Simone and Lena in their plan to drain their victims of their life force, and is a much larger physical threat to the gang as a werecat.]]
* TheCatfish: 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.
* CatsAreMean: Played with. Scooby has an ongoing rivalry with Simone's cats, though the cats themselves are ultimately neutral characters, with no good or evil intentions towards the protagonists. [[spoiler:Played straight with Simone and Lena, who are very legitimately evil {{Cat Girl}}s who gain immortality by stealing visitors' souls]].
** TheStinger shows that Scooby and Simone's cats eventually made peace.
* CelestialDeadline: [[spoiler: The cat creatures have to drain visitors' life forces every midnight on a harvest moon so they can live forever.]]
* CharacterDevelopment: Daphne retains her more proactive personality from ''WesternAnimation/TheThirteenGhostsOfScoobyDoo'', and takes it a step further by never once really being a DamselInDistress (at least, not when others weren't in as much trouble as she).
* ChekhovsGag: During the "It's Terror Time Again" scene, Shaggy accepts a vine from a zombie to pull Scooby out of some quicksand. It seems like a classic DoubleTake gag. [[spoiler:It's actually {{foreshadowing}} that the zombies don't mean any harm.]]
* ChekhovsGun: The cloth Velma uses to clean her glasses. Later, [[spoiler:Simone and Lena use the cloth to power a Velma voodoo doll]]. Fred's ascot serves a similar purpose in this movie.
* CounterfeitCash: This is the scheme the 'Moat Monster' at the start of the movie is attempting to cover up.
* CoversAlwaysLie: The castle on the poster only appears briefly at the beginning of the movie. Most of the movie takes place on a plantation.
* CuteMonsterGirl: Averted and how with the female zombies. [[spoiler: And Simone and Lena's cat forms]].
* DarkerAndEdgier: When it first came out, this was the darkest interpretation of Scooby Doo in existence. It's still one of the scariest with ''WesternAnimation/ScoobyDooMysteryIncorporated'' being the only interpretation that could match it in darkness (and that's saying something!). Plus, this is the first time in Scooby-Doo where characters actually die.
* 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 later eaten. Simone and Lena, the only two survivors, uttered a curse on the pirates and became cat creatures and destroyed them, but upon invoking the cat god's power, they got cursed as well, requiring they drain visitors' life forces every harvest moon to preserve their immortality.]]
* DarkIsNotEvil: [[spoiler:The zombies. They are scary undead monsters... that are just trying to save others from suffering their fate.]]
* DeathEqualsRedemption: Morgan Moonscar and his fellow pirates [[spoiler:come back as zombies and successfully manage to hold off the villains long enough for the spell to be broken]].
* TheDragon: [[spoiler:Lena]].
* DolledUpInstallment: The movie was adapted from the story of an unmade episode of ''[[WesternAnimation/SWATKats SWAT Kats: The Radical Squadron]]'', "The Curse of Kataluna"; the original story was [[ExactlyWhatItSaysOnTheTin supposed to have]] a {{Succubus}}.
* EatTheEvidence: How Scooby and Shaggy got fired from their job sniffing out contraband food in airport luggage.
* {{Expy}}: In one of the direct to TV animated videos made several years later, ''Pirates Ahoy'', they blatantly reused the design for Captain Moonscar for their main pirate monster.
* EmergingFromTheShadows: Lena is introduced this way. Simone later does this [[spoiler: when the gang finds her in the voodoo chamber and her and Lena's true colors are revealed.]]
* ExtremelyShortTimespan: Not counting the prologue, the movie is set over a timeframe of 2 1/2 days.
* FaceHeelDoubleTurn: [[spoiler:The zombies are the good guys while the seemingly benevolent Simone and Lena are the {{Big Bad}}s.]]
* FaceHeelTurn: [[spoiler:Simone and Lena after the curse.]]
* FamilyUnfriendlyDeath: [[spoiler:Simone, Lena and Jacques]] after they miss their deadline for feeding on souls. They disintegrate horrifically--it's worse than vampires, as you can actually see ''bone fragments''.
** In the flashback, when the pirates force the villagers into alligator infested waters...their deaths occur offscreen, but you still hear the screams and other horrible sounds, as the camera shows the horrified faces of the two girls that survived because they hid behind a tree.
* FamilyUnfriendlyViolence: In ''Scooby-Doo on Zombie Island'' there are a few examples of this, one zombie has his head ripped off and two get cut in half.
** Earlier than that, the guy in the monster suit in the intro gives Fred a nasty gash on his back.
** This was likely a remnant of the script's ''SWAT Kats'' origins- that show was full of it.
* FireBreathingDiner: Scooby and Shaggy after eating the Moonscar Island peppers.
* {{Foreshadowing}}:
** ''Zombie Island'' has several signs linking to the end of the mystery, including one in one of the chase sequences, where [[spoiler:a Zombie gives Shaggy a vine to pull Scooby out, at first, it looks like just a gag involving the whole "monster helps them to save themselves", but it foreshadows that the Zombies are not as evil as they're made out to be]].
** Early in the film after being fired from their latest job, Shaggy and Scooby fear going hungry and turning to "skin and bones". [[spoiler: This is more or less exactly the fate that they nearly suffer when Simone and Lena come ''very'' close to draining their lives]].
** [[spoiler:When Fred attempts to pull off what he thinks is a mask off a zombie [[OffWithHisHead and eventually it's not]], he lists out possible suspects with Jacques the ferryman being the last he listed out. While Jacques wasn't a man in a mask, he is revealed to be a villain, making Fred coincidentally accurate when placing him in the list of suspects, as well as a cat creature]].
** The cats in Simone and Lena's house foreshadow that [[spoiler:they're actually werecats.]]
** Simone mentions that the zombies get more restless once night falls. During the daytime, only Morgan Moonscar shows up. During the nighttime, a confederate colonel and a horde of zombies show up. [[spoiler: It's also a hint that the cat-creatures' ritual only happens at night, as that's when the living need the zombies' protection from being sacrificed.]]
** While being chased by zombies, Scooby and Shaggy discover wax dolls of Fred, Daphne, and Velma. After playing with them for a while, Shaggy wonders who could have made them. [[spoiler:It was Lena and Simone.]]
* ForgottenBirthday: Apparently, Daphne forgot her own birthday during production of her show, and she's excited when Shaggy, Scooby and Velma surprise her with a late one during the gang's reunion.
* FromNobodyToNightmare: [[spoiler:Lena and Simone were colonists of Louisiana who lost everything due to Morgan Moonscar. Their revenge turned them into life draining cat monsters.]]
* GameFace: [[spoiler:Lena and Simone reveal their cat-creature faces when they're preparing to sacrifice Velma, Daphne, Fred and Beau. Possibly just to mess with their heads, and their victims are already helpless.]]
* GenreShift: From a straight ''Scooby-Doo'' story, to a supernatural horror mystery film.
* GodOfEvil: [[spoiler:Simone and Lena's cat god that gave them the power to murder the pirates and then drain the life of innocent souls.]]
* GoneHorriblyRight: Daphne laments that her search for real, dangerous monsters has succeeded all too well. [[spoiler:Additionally, Simone and Lena pray to their cat god so that they can get revenge on the pirates that murdered their friends and family. They succeed, only to become cat monsters that suck the life out of others.]]
* GreaterScopeVillain:
** [[spoiler:Morgan Moonscar attacked Lena and Simone's village, causing the villagers to be eaten by crocodiles. This drove them to become cat monsters. However, he is now trying to save the gang from his fate]].
** [[spoiler:The seemingly malevolent cat god is an actual deity who gave Simone and Lena their powers to drain innocent people, but otherwise isn't directly involved in the plot.]]
* TheGreatestStoryNeverTold: After Fred drops the camera into quicksand and [[spoiler:the zombies disappear along with Lena, Simone. and Jacques]] the gang fears that no one will believe their adventure occurred. They realize [[spoiler:Simone's only surviving servant Beau]] can act as a witness, but even he doubts anyone will believe them.
* HeelFaceTurn: It happened to [[spoiler:Morgan Moonscar and his crew after their deaths. The above {{Foreshadowing}} entry makes clear that they ''don't'' want to kill the gang: in spite of being real zombies, they want to scare them away from the area (which was ironically a much more noble version of what most of the series' previous villains wanted to do)]].
* HighPressureEmotion: At one point when Scooby and Shaggy eat the peppers, their entire bodies turn red and red smoke bursts out of their ears and noses.
* HollywoodVoodoo: A textbook example among children's media.
* HumanSacrifice: In a HoldTheLine moment, [[spoiler:the zombies keep the real villains at bay so Scooby's gang can get permanently rid of them]].
* HypocriticalHumor: Early in the film after they've been fired from their airport security job, Shaggy and Scooby worry about the prospect of going hungry and turning to skin and bones. This is after they've [[BalloonBelly become obese]] from eating tons of contraband food.
* {{Hypocrite}}: [[spoiler:Despite being a werecat, Simone at one point refers to Scooby as a beast.]]
* IncongruouslyDressedZombie: A rare justified case. The zombies are an ecletic bunch of victims taken at various points throughout history, so they range from 18th century pirates all the way up to modern tourists.
* ItsAlwaysMardiGrasInNewOrleans: Averted. There isn't a single mention of Mardi Gras in the entire film.
* KnightOfCerebus: [[spoiler: Lena, Simone and Jacques are ''not'' your usual Scooby Doo villains.]]
* LastMinuteHookup: [[spoiler:Velma and Beau, once Beau is revealed to be an undercover agent investigating the disappearances.]]
* MightyGlacier: In spite of their slowness, the zombies are apparently physically strong enough to give the [[spoiler:werecats]] a run for their money - at one point, two zombies each manage to tackle and momentarily stun a [[spoiler:werecat]]. Though, this could also be justified by the zombies in question being Civil War soldiers.
* MonochromePast: [[spoiler: Simone's tragic backstory is depicted with old-fashioned sepia tone.]]
* MoodWhiplash: This film goes back and forth from the usual Hanna-Barbera cartoonish hijinks (mostly surrounding around Shaggy and Scooby) that would make children laugh to the dead serious and scary situations that would give children nightmares.
* Creator/MookDLE: First of four direct-to-videos animations for the franchise. (Another remnant of how the script started; they animated season 2 of ''SWAT Kats''.)
* MythologyGag: Fred tries on his orange ascot while getting ready for dinner at Simone's mansion, but tosses it aside after realizing it looks ridiculous. Also see YouMeddlingKids below.
** Daphne being the believer and Fred being the skeptic is a reversal of their roles in ''WesternAnimation/APupNamedScoobyDoo''.
*** Speaking of ''Pup'', it may be a coincidence, but one of the crooks the gang unmasks during the montage resembles an adult Red Herring.
* NeverSayDie: [[spoiler: Simone points out during her tragic backstory that she and Lena "destroyed" the pirates upon granting their curse from the cat god.]]
* NeverSmileAtACrocodile: Morgan Moonscar and his men [[spoiler: drove the other settlers from Simone's and Lena's village into the swamp, where alligators surrounded and presumably ate them.]]
* NightmareFace: [[spoiler: Simone gives one to the camera when she partially undergoes her werecat transformation and again with Lena when they fully transform.]]
* NoImmortalInertia: [[spoiler:When they miss their [[CelestialDeadline deadline for feeding]], the three villains all dissolve horrifically into puddles of decayed bio-matter within a few seconds]].
* NoOntologicalInertia: [[spoiler:When Simone and Lena are draining Shaggy and Scooby's life forces, they rapidly age upon contact, but once they are yanked away thanks to Daphne and Velma making voodoo dolls of them, Shaggy and Scooby immediately return to normal seconds later.]]
* NotAMask: Fred tries to remove a mask from a zombie. Instead he tears the zombie's head off.
* NotAZombie: A rare case of this reaction being completely justified given the characters involved. Both Averted and played straight. The avert is one of the Mysteries the gang is doing involves a zombie ship captain (which happens to be a woman in the costume). Played straight with not only Morgan Moonscar, but [[spoiler:his pirate crew,]] other inhabitants, ''Civil War soldiers'', and past tourists.
* NotEvilJustMisunderstood: Two cases:
** 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, 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.]]
* OlderThanTheyLook[=/=]ReallySevenHundredYearsOld: [[spoiler: Although Simone and Lena look like regular young adults, they're really over two hundred years old, due to the cat god's curse rendering them immortal as long as they drain a visitor's life force every harvest moon. The same goes for Jacques, who looks old but is given immortality by them.]]
* OurWerebeastsAreDifferent: Specifically, this story gives us [[spoiler:werecats. The curse was brought on by invoking the power of some vaguely described cat god that was worshiped by the island's original inhabitants. The werecats transform entirely at will, but usually remain in their human forms. It isn't clear if, or how, others can be turned into werecats in the typical werebeast fashion (bites, scratches, etc) - the two original werecats have only ever turned one person, but it isn't explained how they did this. The curse also grants immortality, provided the werecats steal the life forces of others every harvest moon.]]
* 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.]]
* OutdatedOutfit: During the opening sequence, the gang is seen in their classic outfits from the original show. For the rest of the film -- and for that matter the rest of the series up until ''Mystery Inc.,'' they wear more modern clothes. [[TakeThat Fred even throws his prized ascot away.]]
* PetTheDog: 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.
* PragmaticAdaptation: Many would even contest that this is ''the best'' Scooby-Doo story ever. Hands down. And, as stated, it started out as an episode of a completely different series which had the darkness as standard fare.
* {{UsefulNotes/Punk}}: While [[https://www.youtube.com/watch?v=RDFouH2v8UM The Ghost is Here]] is of the PopPunk variety, as was popular at [[TheNineties the time]], [[https://www.youtube.com/watch?v=F2hztmQ0E3w It's Terror Time]] dives head first into straight-up Horror Punk...& it's as [[AwesomeMusic spectacularly awesome]] & fitting as you'd expect for one of the best, & genuinely horrifying, Scooby-Doo films ever.
* PreMortemOneLiner: Velma says one [[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.]]
-->'''Velma:''' [[spoiler: Looks like your nine lives are up!]]
* PuttingTheBandBackTogether: The story opens up after the gang have been separated for a number of years. Given how a few minor appearances aside this was the first new Scooby media in seven years, there's a bit of RealitySubtext to it. The film's success is most likely why the first live action movie used this to set up the plot of that film.
* QuicksandSucks: It's a major hazard on the island.
* RapidAging: [[spoiler: Happens to Shaggy and Scooby when Simone and Lena are draining their life forces, [[NoOntologicalInertia only to return to normal after they lose physical contact with them.]] Eventually it occurs with Simone, Lena and Jacques, since they missed their CelestialDeadline and turn to dust instantly.]]
* [[RedemptionEqualsDeath Redemption Equals Undeath]] / 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.]]
* RedHerring: This movie started a trend of an entire gallery of herrings.
** 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.]]
** Snakebite Scruggs is quickly shrugged off as a suspect since while he's a nasty guy, he still saved Shaggy and Scooby from alligators.
** 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]].
* RealityEnsues: Several instances
** The gang splits up because they got fed up with all the idea of fighting people in masks. Turns out no matter how good you are with people, when it comes to doing the same thing over and over again, the group will split because someone wants something different. Given that Daphne was the one who split first, even if it isn't stated exactly on screen, it quickly led the other gang members to part ways, albeit reluctantly.
** Simone and Lena were able to kill large amounts of people from several centuries in large part due to the fact the area was remote, the time period usually had people die from disease, ships sinking, and war, and if it wasn't that, they were usually fugitives who no one would mind. Once it becomes obvious more modern tourist people start disappearing on the island, it doesn't take long for the cops to launch an investigation, and given Beau was TheMole for them working as a gardener, it quickly becomes obvious they were considered prime suspects.
** Why are most of the zombies in the area of the swamp or near them? Simone, Lena, and Jaccques quite realized very quickly that while pirates and colonists, along with soldiers could be washed away, large amounts of people from the modern era could not, so they threw the bodies in the swamp for several reasons. Number one, the alligators are a massive deterrent. The quicksand, while the zombies seem to be smart enough to move around it, force lengthily detours that are long enough to delay from getting to the chamber. But thirdly, in the event the cops suspected them of murder or launched an investigation, they threw them into the swamp to ensure that it wouldn't be an area close enough to the house to portray them as potential murderers.
* RewatchBonus: Those who've already seen the movie will know not to trust [[spoiler: Simone and Lena, as they're hiding something rather vicious.]]
* RoleReprisal: Creator/FrankWelker returns to voice Fred for the first time since 1984 -- admittedly this is the first time Adult!Fred had appeared in ''any'' media since 1984. Welker is the ''only'' one of the original voice actors to do so (though it's heavily implied Creator/DonMessick would also have returned had he lived).
* RomanticFalseLead: Daphne and Fred develop crushes on Beau and Lena, respectively, invoking each other's jealousy.
* RunningGag:
** Scooby and Shaggy sampling some of Simone's spiciest peppers. [[spoiler:They use it to fend off Jacques in the climax.]]
** The gang unintentionally interfering with Snakebite's attempts to catch a catfish named Big Mona.
** [[ObliviousToHisOwnDescription Dog? Where?]]
** Scooby Doo has a tendency to chase Simone's cats.
* ScoobyDoobyDoors: Played with briefly at the beginning, where Shaggy and Scooby are running from a monster, and use a hallway with doors to this effect while the monster just stands at the end of the hall and watches them.
* ScoobyDooHoax: Averted in the main villains' plan, but played straight for all the "monsters" the gang encounters before Lena invites them to Moonscar Island. [[DeconstructedTrope It's why the gang disbanded.]]
-->'''Chris:''' Got a little boring, eh?
* ShownTheirWork: When Beau is revealed as an undercover cop and a police inside man, given he was nearly killed by the cat creatures, it is stunning that the police, knowing people have a tendency to vanish on the island, would put an inside man in such jeopardy, especially given there was no proof of foul play. However, this is usually how the cops investigate remote area crimes such as disappearances with no firm proof of criminal involvement. If there is a person, try to get them employed and have them investigate it. Either way, they have a suspect or some idea of what happened. If Beau found some hints of what happened, he could tell his superiors, if he died, well then they have two or three suspects.
* SicklyGreenGlow: [[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.]]]]
* SkepticNoLonger: Fred's denial of the supernatural vanishes ''very'' quickly.
* SpannerInTheWorks: [[spoiler:Lena and Simone's decision not to make wax dolls out of Shaggy and Scooby ends up being one of the deciding factors of them missing their deadline in the climax.]]
* StabTheScorpion: After much criticism from Velma, Beau picks up a large rock, and it looks like he's going to hurt her with it. Instead, he throws it in front of her, revealing that she was about to step in quicksand. She thanked him, but she ''still'' sees him as a suspect.
* StartOfDarkness: [[spoiler:As told via {{Flashback}} by Lena and Simone -- they originally gained dark powers to get vengeance on the pirates that destroyed their home, but the price of the power turned them to evil.]]
* StatusQuoIsGod: Mystery Inc. has broken up? Not for long.
** Averted with the events of Zombie Island, which saw the series introducing more real monsters for the gang in many of their future adventures to come.
* StockAudioClip: There's a particular audio clip of Shaggy struggling that's used about four or five times throughout the movie. Once you notice, it's very distracting.
* TakeThat: While dressing for dinner, Fred puts his old ascot on, then says "Nah." and throws it back into his suitcase.
* ThemeTuneCameo: Fred whistles the theme song to ''Scooby-Doo, Where Are You?'' at one part.
* TimeSkip: The movie begins with a flashback of a routine mystery, then progresses several years after the disbandment of Mystery Inc. Daphne hosts a popular talk show, Fred produces her show, Scooby and Shaggy work as security at an airport, and Velma owns a store selling mystery books.
* TookALevelInBadass: Sure, she would lose them in the next few movies, but ''Daphne.''
* TrailersAlwaysSpoil:
** One of the alternate posters for the film features [[spoiler:Jacques in his were-cat form.]]
** In addition, the trailers promise "this time, the monsters are real", and at least one used the tagline during the scene of the vampire bat monster chasing Scooby and Shaggy... but just a few moments before, it showed the monster being unmasked as a fake.
* TransformationSequence: [[spoiler: Simone and Lena have one as they transform into werecats and prepare to drain the gang's life forces.]]
* UndercoverCopReveal: [[spoiler:Beau, although not in a way that matters to the plot.]]
* VoluntaryShapeshifting: [[spoiler:Simone and Lena invert wearing a monster costume like previous Scooby-Doo villains by being monstrous werecats underneath their human disguises.]]
* VoodooDoll: Used by [[spoiler:Simone and Lena]] at one point.
* WalkIntoCameraObstruction: With Lena as she is showing Fred to his room.
* WhamLine:
--->[[spoiler:'''Simone:''']] [[EvilAllAlong I've been getting away with it for]] [[spoiler:''[[ReallySevenHundredYearsOld two hundred years!]]'']]
** Before, that moment, Velma made an interesting observation that foreshadow what Lena and Simone are planning.
-->[[spoiler:'''Velma''': Her story about Simone getting dragged away by zombies wasn't true. I saw the footprints of Simone's heels. She wasn't ''dragged,'' she ''walked'' down that tunnel!]]
* WhamShot: Fred encounters a zombie, and attempts to remove its mask:
-->'''Fred''': It's the gardener.\\
'''Daphne''': No!\\
'''Fred''': It's the fisherman.\\
'''Shaggy''': No!\\
'''Fred''': It's the ferryman.\\
* ''[[NotAMask Pulls the zombie's head off]]''*\\
'''Fred''': [[OhCrap Maybe it's]]... Real?
* WhatHappenedToTheMouse: A RunningGag throughout the movie is Scooby chasing Simone's cats every time he sees them. The leader of Simone's cats is a [[LightIsNotGood white cat]] that torments Scooby more than the others, but it suddenly disappears from the movie while the others are still constantly seen. [[spoiler:Even during the ending where the cats are shown to have boarded the ship with Scooby and co., leaving the island, the white cat is nowhere to be seen, not even in the post credits scene where Scooby makes peace with the cats.]]
* WoobieDestroyerOfWorlds: [[spoiler:Simone and Lena.]]
* WrongGenreSavvy: Fred. All his theories and guesses about who could be faking the ghost and zombie appearances on Moonscar Island, and why they'd be doing it would probably be right, if it wasn't for the fact that this film is a {{Deconstruction}} and {{Reconstruction}} of the Scooby-Doo formula by showing what happens when the usual ScoobyDooHoax gets averted.
* YouMeddlingKids:
-->[[spoiler:'''Simone:''']] [[VillainousBreakdown I've had enough of that meddling dog!]]
* YourCostumeNeedsWork: When the gang captures a lone zombie, they initially believe it to be an obvious fake, an unusual case of GenreSavvy for this franchise. Unfortunately for them, in this case they're WrongGenreSavvy.