Fred, Daphne, Velma, Shaggy and Scooby-Doo are back! This time they're solving mysteries in the spooky town of Crystal Cove, a sleepy coastal village that boasts a long history of ghostly sightings, werewolves and glowing deep-sea divers. Because of all the mystery, Crystal Cove has become a tourist hotspot taking in major profits, and the townspeople don't appreciate the meddling of the renowned sleuthing team. In Scooby-Doo! Mystery Incorporated, the curious gang investigates every circumstance with a questioning mindset.
Crystal Cove may be the most haunted town in the world, but that doesn't stop Scooby and the gang from trying to prove that most of its most famous tourist attractions were fakes much to the anger and dwindling profits of their parents.) But when a radioactive barrell is accidentally opened releasing a hideous sewer beast that cocoons it's victims in frozen yogurt, their mystery solving skill are put to the test.
A long time ago there was a town called Gatorburg, where gators flowed wild and free and people got rich. Now it's a ghost town. Gators are all dried up. But when Scooby and the gang receive an imitation Gatorburg Purse, they decide to see for themselves if the gators really are gone. Forced to stay overnight when someone steals the engine to the Mystery Machine, they soon discover that gators have indeed returned... only these have comb-overs, walk on two legs-and don't like visitors.
A mysterious "Ghost Trucker" is terrorizing Crystal Cove. Add to that all the doorknobs have begun to disappear from around town, someone has hidden a priceless diamond, and Fred's dad the Mayor is up for reelection against a guy named Avocados, and Scooby and the gang have their hands full. Oh, and did we mention that Daphne has been set up on a blind date with a pinhead named Rung Ladderton, who... wait for it--sells ladders for a living.
While hosting a volleyball tournament for Trickell's Triquid diet moisture, a smooth drinking beverage that's just like water except not so fatty, Crystal Cove beach finds itself attacked by a hideous Man Crab who has taken a liking to the tournament's female players. Desperate to stop this beast before it scares away all the tourists, the gang investigates, convinced it is a disgruntled local named Skipper Shelton(famous for his delicious clam filled waffle cones, his missing nose, and his hatred for Crystal Cove beaurocrats.)
A hideous creature named Que Horrifico is turning the children of Crystal Cove in to monsters. The adults in the town are in shock, reacting in the only way they know how... By abandoning their children and running away like cowards. Only Scooby and the gang stay behind to solve the mystery. Going undercover as a family-the gang rents a house in order to capture Que Horrifico.
There's a new girl at Crystal Cove High named Alice May and she's set her romantic sights on Fred. Only one problem... Alice is Dead! That's right, Fred's new girlfriend is a dead girl. Alice is a ghost, famous for snatching up guys like Fred and disappearing with them forever. Now she wants to take Fred to the prom, which means he's next. Fortunately, Daphne also wants to go to the prom with Fred and she's not going to let Alice beat her to the "punch" bowl (wink-wink).
Velma's favorite band "The Hex Girls" is in town, and the gang has a front row seat. Unfortunately, so does an evil specter named The Phantom who wants the Hex Girls out of the music business-permanently! Solution? Send Daphne undercover as Crush, the newest member of the band. But when she's nabbed by the Phantom, Fred goes in to freakout mode, finally realizing he actually has feelings for Daphne.
The Royal Knights Faire has come to Crystal Cove and the whole gang is in attendance. Unfortunately, so is a scary gnome who has begun attacking and paralyzing guests. Specifically, guests who are wearing pirate costumes. The gang decides to help trap the gnome, but when Shaggy-who is dressed as a pirate along with Scooby-is captured by the frightening little beast, it quickly becomes a race against time to find him, or Scooby could lose his best buddy... forever.
A pair of brutal Gargantuas begin breaking apart the town, which sadly mirrors the fractured relationship of Mystery, Inc. See, while searching for Shaggy, Scooby accidentally discovers him kanoodling with Velma. Feeling betrayed, Scooby is inconsolable, despite the best efforts of Fred and Daphne to cheer him up and put the team back together.
After a horrible, mechanized beast begins attacking the town, all fingers begin pointing at Scooby. Before the gang can clear his name, the Sheriff has Scooby hauled away to the "Crystal Cove Hospital For Criminally Insane Animals". Now it's up to the gang to clear Scooby's good name. But standing in their way is a new enemy they hadn't counted on: a diabolical parrot named Professor Pericles who knows more about Mystery Inc. than he should.
There’s a vampire loose in the town, terrorizing the residents and stealing an odd assortment of loot. When the gang does some sniffing around, they discover an unlikely suspect… Daphne’s MOTHER. Things are already strained within Mystery Inc., and with this latest blow, the gang is truly torn in half. Girls on one side, boys on the other.
With Mystery Inc. broken up, the gang decides to check out life after High School and spend a weekend at DARROW COLLEGE. But things don’t go as planned when a creature called CHAR GAR GOTHAKON begins terrorizing the campus. Turns out this beast is a fictional character come to life. A creation of the author H.P. HATECRAFT who is a professor at the school. Although one of the other professors, HARLAN ELLISON, claims Hatecraft is a fraud, the creature is definitely real. And when it attacks and carries off Hatecraft to his doom, the gang realizes it has to come together once again to solve this mystery and save Hatecraft’s life.
Bugs are taking over Crystal Cove and attacking some of its most prominent citizens. With Mystery Inc. back together as a team, they begin to investigate and discover that all of the attacks have been on employees of a company called Destroido that makes Shaggy and Scooby's favorite snack food--"Grandma Moonbeams Nature Slivers". Somebody, or something wants the company shut down. But when the gang gets too close to the truth, they become the bug's newest target.
The Mystery Inc. gang has been invited to compete in the annual “Teen Mystery Solver’s Convention” A weekend affair where mystery-solving teams from around the country compete to solve a mystery. But when the mystery turns out to be the disappearance of the teams themselves, it is up to the team sidekicks – led by Scooby-Doo – to find out what’s behind it all. And this mystery needs to be solved by the end of the weekend… or they’ll never see their friends again.
A rowdy Orc biker gang has decided to roll through Crystal Cove and no one is very happy about it – especially Fred, who freaks out when Daphne gets a crush on their leader “Odnarb” while he and Daphne are out on their first date. Daphne is convinced that the Orcs are misunderstood, but Fred and the rest of the gang think different. When valuable military equipment begins disappearing from around town, all fingers point to the Orcs. It’s up to Daphne alone to prove their innocence. Unfortunately, Fred and the rest of the gang are there, every step of the way, to prove her wrong.
Love has come to Crystal Cove in the form of an evil woman by the name of Aphrodite. Although she appears beautiful to those under her spell, in reality, she is horribly ugly with no real interest in love. What she wants is the destruction of Crystal Cove itself. Mystery Inc. is helpless to stop her, because her love spell has twisted the minds of Fred, Daphene, Velma, and Shaggy – making them fall madly in love with each other. Only Scooby isn’t affected. Left on his own to solve this mystery, he fortunately gets some help from an odd ally: the gang’s old nemesis Professor Pericles. But is Pericles really there to help? Or does he have other plans for Scooby-Doo?
While investigating the disappearance of the original Mystery Inc. gang that disappeared, the gang discovers that they were last seen going in to the abandoned mansion once owned by The Darrow Family, the very family that founded Crystal Cove. But once inside the mansion, they find themselves trapped by a crazy old man-Danny Darrow, the youngest member of the Darrow family-who has been living there for decades. He's booby-trapped the whole house to make sure that no one tries to steal "his treasure".
After an exchange student named Mai Lee shows up in town to stay with Velma, strange Kung Fu wizards begin attacking the town trying to get her. As it turns out, Mai Lee has a ring they are after. The gang decides to help – but friction arises when Shaggy develops a crush on Mai Lee that really gets under Velma's skin; and Fred inadvertently trashes Daphne's home when the wizards attack there. Fortunately, they find an ally in Crystal Coves Tea Shop owner Chen, who reveals to them that the wizards are after the “Dragon’s Heart,” a mythical jewel that he just happens to be guarding. Now, it's up to the gang to solve the mystery before they lose the Dragon's Heart, and Mai Lee... forever!
Shaggy and Scooby win a dinner date with their hero, Vincent Van Ghoul. What they don't realize is that they are unwitting participants in Van Ghoul's new reality television show where he has dinner with people, then scares them out of their wits - and it's all caught on camera. But when a real monster known as Nightfright locks the three up in Van Ghoul's home and terrorizes them, it is up to Fred, Daphne, and Velma to solve the mystery and rescue their friends.
Velma is feeling like a fifth wheel. Fred has Daphne, and Shaggy has Scooby. Who does she have? So, when a mysterious "Mer-woman" named Amy contacts Velma on her blog, she decides that maybe this will be her special friend.
After the Mayor purchases a haunted temple off the Internet, Crystal Cove's only theme park - Creepy Spooky Terror Land - is besieged by a Manticore, an ancient beast with the body of a dragon, the face of a man and the tail of a scorpion. The Mayor begs the gang to help him solve this mystery and get rid of the Manticore before the theme park goes out of business. Turns out, though, that the park is owned by the father of none other than Hotdog Water, Velma's archenemy at school. And Hotdog Water makes it very clear... she does not want the gang's help.
Fred's favorite adventurer, Rick Spartan, has come to town to take over the school's biology class. But Rick is not alone. He is being haunted by The Headless Creature - a monster from the Amazon who believes Rick has taken his head.
Mayor Jones is under attack by a poltergeist in his own home,and the only ones who can help him are Scooby and the gang. After hiring a Voodoo Priestess to help rid the Mayor's home of evil spirits,the gang discovers that there is more to this haunting.
There's a new lawman in town, and his name is Dead Justice! An undead cowboy sheriff who once patrolled the streets of Crystal Cove, Justice has now returned to take back his old job. That means getting rid of the gang's number one nemesis...Sheriff Stone. But when the gang realizes that Dead Justice might not be the Good Samaritan he claims to be, they decide to help Sheriff Stone uncover the true face of "Justics."
Close to finally unraveling what happened to the original Mystery Incorporated kids, the gang finds "The Obliteratrix" standing in their way. Now, up against this vicious undead assassin who's vowed to destroy them, the gang's only chance to solve the mystery and stay alive, and seek help from an old friend... H.P. Hatecraft.
The mystery comes to a close as the gang finally gets to the bottom of what happened to the original Mystery Incorporated and why they disappeared. The truth, however, is not without its price. A monster known as "The Freak Of Crystal Cove" is determined to stop our heroes - even if he has to bring the caves beneath Crystal Cove down on top of them he will do it to preserve his secret!