The kids head to the tv station ZPOP to surprise Scooby, who thinks they have forgotten his birthday. When there, Scooby is surprised with "This Is Your Life Scooby Doo", hosted by Mark Winkendale. Special surprise guests include Velma, Freddie, and Mrs.Vandereel, whom they helped by solving the mystery of the Red Skull Curse. Before too long the Red Skull comes back and steals the Last Hope Diamond again, but is it really Freddie as everyone seems to believe?

While in search of Louie's Pizza Palace, the kids get lost and stop for directions at the Von Gizmo Estate. While there, they encounter Ratfink, the Von Gizmo twins ex-assistant, who claims they stole his secret invention, the "helping hands", which turn out to be remote controlled hands.

The kids are hired by Orson Kane, a publisher, to do a story on Norma Deathman, an actress whose last movie, "Fangs For The Memories", was filmed in 1933, and she has not since been photographed or interviewed. The kids go in disguise as "Creepy Caterers" to her birthday party, but when Norma's jewels turn up missing, the gang must find out who stole them before they get blamed.

The kids are summoned to the Overview Hotel by Jack Marstin, the owner, to rid it of the ghost of Ebenezer Overview, the former owner who died 100 years before. It seems that some of the guest are not frightened though, like Sheldon Keets, the horror novelist and occultist, and Mrs. VanLoon and her invisible dog. Does it have anything to do with the Western Air Command Base down the street?

The Un-DOO-Able Team, under the lead of Agent Doo, set out to nab the no good crook, Mastermind. It seems he hired some "technicians" to build a transponder beam in the Statue Of Liberty. This will allow him to control the world if the team can't stop him.

Next stop on the Cheapo European Tour, Denmark, and it seems there is something "rotten in Denmark" as the kids run into the ghost of Hamlet at the Castle Hotel Hamlet they are staying in. The ghost whats to let the kids know something though, "Beware, the Bridey Boo!".

The Scooby Doo Detective Agency is hired by Heir Driesbach of the Black Forest Toy Shop, to discover who is stealing his profits from his safe. Does it have anything to do with the toy store being built over the elf kingdom, and where is the treasure that Heir Driesbach's grandfather found?

The gang heads to Las Vegas's, Circus A Go-Go, to see cousin Dooby Doo in concert. Soon it seems someone is out to kidnap Dooby Doo and steal his fancy collar, which was a present from a fan in New York, so Scooby turns decoy with a fake collar. Looks like trouble!

At the Top Secret Army Compound, Code Nose the master spy, steals the Top Secret Government Decoder. While on the getaway, he stashes it in Pingree's Department Store. The government recruits the gang to find the decoder named "Myrtle", by using code words it responds too, throughout the store.

Dr. Carlin, director of research, at the Antartic Scientific Research Camp, hires the detectives to find out who is sabotaging his research work on sea lions and penguins. All the researchers want to go home, but the Professor won't let them leave until the research information is found.

Mr.Doo and the Bee Team are hired by Nathan Stinger, owner of "Bee In Your Bonnet" Honey Farm. It seems giant renegade bee have been invading his farm and stealing his hives and honey, but what is wrong with this strange tasting honey, and why do they want it?

The gang heads over to the Showboat to see Dixie Doo. But before long, all the customers are scared away by the ghost of Col. Beureguard, who is looking for Magnolia. She believed he stole her priceless emerald necklace, so she refused to marry him all those years ago. Can the gang solve the mystery and rid the showboat of it's haunts?

In the Greek Islands, the kids head for Cyclops Island, to find the legendary "Mask of Medusa" with Professor Meikas. But it seem that Thadeus Blimp, a treasure theif, wants the mask too, and he plans to turn all the world leaders and his enemies, including Scooby, to stone.

The kids head over to the Experimental Institute for Evolutionary Improvement of Organism, also know as EIEIO, to help old Mr.McDonald, the director, discover who is creating monsters with the secret formula that he developed to create large amounts of food.

Velma, a research assistant for NASA, brings Daphne, Shaggy and the dogs out to dinner at the White House where they are discussing the new space station Velma helped with. To everyones surprise, the ghost of George Washington comes, and says he wants to reclaim his home. With that come a few more "presidential" ghosts, a brass eagle, and paintings that are missing, and others with their eyes cut out. Why are these ghosts haunting the White House?

The kids are on a South American expedition with Velma's uncle, Professor Cosmo Dinkley, to recover the "Celestial Orb" a baseball sized ruby, that has a map to the Lost Temple of Syrius. The temple is believed to have been built by the ancient astronauts and filled with secrets and treasure. It soon seems that they are not the only ones searching, Professor Dinkleys ex-assistant Ms.Mullens is lurking in the background, waiting to steal the orb.

The kids are invited to a Halloween Party, but little do they know that the party guests are really monsters who need their help. Will the kids stay and help them out, or run and hide?

The gang goes on a Hollywood tour of Bananatoon Studios, where Scrappy's favorite cartoon, "Hero Hound", is created. While there they run into a mystery and are hired by Mr.Buster Banana, the studio head, to find out why the evil Monster Mutt is stealing all the films in the studio.

When Mystery Solvers Magazine holds it's first annual "Mystery Solvers Contest" in London, Freddie, Daphne, Shaggy, and the dogs attend. Along with other detectives, they must solve "The Mystery of the Blue Carbuncle", Sherlock Holmes last unsolved case. But they are not alone, soon the ghost of Sherlock Holmes, is following the gang around, and it seems he is trying to help them, but is he? When Sherlock steals security system blueprints, and the gang is the ones believed to have done it, they must clear there names before it's too late.

The kids are spending the holidays helping out at a childrens home with the play, The Nutcracker. But the scrooge-like neighbor wants them out so he can have the building and before long the gang learns of a priceless emerald that is reported to be inside the home. Will the kids find it and save the childrens home?