After coming back from the movies Scooby-Doo and Shaggy come across a pick up truck and a suit of armor in the driver's seat. According to an ancient superstition the armor comes to life during the night of a full moon.
The gang gets shipwrecked on an island that happens to be an old lair for a pirate. They find a map, but there is a warning telling them to leave the island. The warning appears justified when a ghost called 'The Phantom' is after them.
While Scooby-Doo is surfing, he encounters a creature in a diving suit. An old sea salt tells the gang that it's the ghost of Captain Cutler who is responsible for the disappearance of many ships.
Thanks to Shaggy's slightly flawed map reading skills, the gang finds themselves in an abandoned western town. The owner tells them that guests were scared off by a strange man who came to the town centuries ago and won't leave until he finds the last remains of his gold claim.
Scooby-Doo witnesses a dog kidnapping at the park. After hearing about it, the gang decides to use Scooby-Doo as bait to capture the kidnappers.
The gang sees a strange man go into a weird mansion. They learn that he is a friend of their Uncle Stewart. Stewart tells them that the ghost of the Kingston Mansion caused him to turn old. Strange things start happening when Sharron and Uncle Stewart vanish.
The gang gets volunteered as workers by Daphne's uncle, a director currently filming a movie about a fierce creature called the ape man. Rumor has it that the real ape man is alive. The gang soon learns that it's not just a rumor.
The gang gets excited about the opening of an amusement park. But when they see the rides on before it opens, they start to get suspicious.
While coming home from pizza, Shaggy finds a violin case full of money. While calling the gang Scooby-Doo goes to help an injured poodle and the money is taken. The gang suspects that the money was fake.
The gang rescues two circus people who tell them that they have left a circus because it's bad luck. The ring master tells them of a mysterious person called 'The Ghost Clown' who is responsible for the many strange accidents and incidents.
The gang, on their way to the Frankenstein castle, visits a gypsy who warns them not to go. They ignore her warning and go anyway. The trouble begins when Daphne is taken hostage and the gang finds themselves in the clutches of a trio of monsters.
The gang, at the college museum, gets the lead on a dead Egyptian ruler named Inca. According to an ancient superstition, if he were ever removed from his crypt, he would turn the people who moved him to stone. Shaggy finds a rare coin that the Professor is trying to study. The trouble begins when Shaggy accidentally takes the coin and the mummy is loose looking for it.
The gang gets lost while driving to a concert. They ask a man to give them directions only to learn that he's a zombie. They also learn of a nearby witch who is responsible for the zombie's resurrection.
The gang is low on gas so they go to a farmhouse. The farmer tells them he's been harassed by reporters ever since an alien showed up. It's not just any alien, but a ghostly alien.
The gang learns that the ghost of long dead pirate has returned and is continuing on where he left off centuries ago.
Scooby-Doo inherits a mansion because he saved the Colonel from drowning years ago. He and some other heirs will each get a fortune but there's a warning that the house is haunted. The warning appears justified when someone (or something) comes to frighten the heirs away.
The gang is vacationing in the Himalayas. They go to a winter lodge where the owner tells them about the ghost of a Yeti that is out to get revenge on the man that caused his death and will turn anyone into ghosts.