Local garter snake population explosion; weatherman controlling the weather.
The ageing but still phantasmagoric Rockin' Reptiles are on a reunion tour that just might transform the kids' strange dressing and strange talking mothers into eerie reptiles.
Mona and her friends enter a sand sculpture contest and unwittingly awaken the spirit of a mischievous sandman who seems to be bent on putting the whole town to sleep.
The Seville Theater is being haunted; Mona thinks a yeti is inhabiting a ski hill.
The kids uncover a plot to enslave the town; George's rough ride on a haunted bus.
Family of aliens with identical triplet sons; prank happy Coyote god on the loose.
The circus is being haunted by the ghost of the flying trapeze; officer Halcroft has a showdown with his old nemesis at the bowling alley.
After the kids encounter a maniacal wizard at the new Laser Dome, everything they imagine starts to come true.
A trip out to a cornfield maze reveals the horrible truth of an imminent alien invasion.
Neptune discovers the missing continent of Atlantis; Shadflies make an early appearance.
Misfortunes occur to everyone who goes to the fortune teller; the owner of a local health food store is kidnapped.
Charley awakens the Viking god Thor; Mona, Lily and Charley must stop their substitute music teacher from transforming everyone in town.
Mom's new pottery obsession leads Mona and her friends to investigate the pottery studio where they discover the clay is a little too lifelike.
Charley gets more than he bargained for when he finds a real asteroid.
Charley's super microwave invention proves to be a window on the future.
Mona and her friends find themselves matchmaking between a lovelorn vampire lady and a lonely werewolf.
An old ghost from a train robbery has the kids reopen the case; Mona, Lily and Charley investigate a rash of wereclown sightings.
Mona catches a mythological beast; Mona finds the ghost of Caboose Malloy.
The sponsor of a spelling bee goes to great lengths to ensure that his son wins.
A toy factory makes robots to take over the world; aliens hide within hideous wigs.
Mona's antique jack-in-the-box spawns a trouble-making boy named Jack; cornfield crop circles foretell an imminent alien invasion.
The great Phineas arrives with plans to solve the town's traffic problems, but Mona realizes that he is an ancient pharaoh intending to enslave the locals.
Lilly gets sucked into her television.
A jealous guest brings a mysterious gift to a wedding.
Mona and the gang grow suspicious when large quantities of food go missing after Mr. Hyde restores an old ice cream sign of Freddy Frosty.
A black hole is threatening to swallow up the town; it has already swallowed Rob the astronomer and if Mona does not do something fast, she may be next.
Mona finds that her strange aunt is really a black widow spider out to devour her next victim.
The trio attends a disappointing space camp, run by a real astronaut who turns out to be an alien imposter.
Mona battles a creature made of rubbish during a garbage collector's strike.
Mona uncovers a bizarre connection between a flu epidemic at school and alien abductions.
Charley joins a boys' camping club, only to be brainwashed by the leader, who is obsessed with winning a competition against a rival girls' club.
A new boy in Mona's class has a shady past in the Natural History Museum.
Charley gets trapped inside the mansion of a famous mystery writer who lives alone with her creepy butler.
When a heat wave brings on a drought in town, Mona discovers something strange lurking in the river bed.
Mona's cat is held captive by an underwater emperor.
Mona suspects that Charlie's new soccer coach is actually a sasquatch bent on eating the players.
A ventriloquist act gets big laughs at Mona's expense; Mona notices a mysterious limousine.
Mona finds out that the trolls living in the basement are stealing valuables in her house.
A librarian tries to fine Mona for bringing a book back late.
Mona discovers that Cupid is suffering from a broken heart and it's up to her to save Valentine's Day.
Mona's cousin causes trouble when he gets hold of a comic and brings a villain to life.
A dead uncle returns to complete a mission.
The local park keeper seems to be behaving very strangely.
Strange things start to happen after a mysterious clockmaker does some work on the town clock.
Angela's new pet parrot seems just a bit too clever and Mona is suspicious; she finds that it is, in fact, an apprentice magician cursed by another magician many centuries ago.
A creature feeds on the energy of others; teachers are substituted by aliens.
When Lily starts acting strangely and spending time with Angela, Mona is convinced it has something to do with pixies.
When the fleas begin to feast on Mona, Dad takes drastic action.
Mona tries to capture an evil genie; Angela designs creepy dolls.
Rattling, groans and soggy floors; a werewolf is loose in the school.
Mona is trapped in an alternate dimension while an evil replica of herself causes havoc in the real world.
A gremlin sabotages a stunt man's motorcycle; a yam terrorizes the town.
Charley's having his bedroom redecorated, so he moves back into his old room; however, he finds he can't sleep and the bogeyman visits him every night, so he turns to Mona for help.
At night a distant, mournful wail comes from the swamp; Mona suspects the sound can be only one thing, the cry of the legendary swamp creature.
Mona investigates the unusual haunting of the all-night laundromat.
Mona tries to bring Freaky the Snowman back to life after finding him preserved in the freezer.
Mona's scrapbook goes missing.
A siren puts a spell on Charley.
An ancient curse plagues the town; aliens plot to dominate the world.
Mona attempts to ward off an alien invasion.
Mona is too busy for a fashion show while trying to save the town from the Living Mannequin, but finds herself a reluctant finalist.
Mona becomes a costume competition finalist; a ray gun shrinks Mona and Charlie.
Mona investigates when garden gnomes start to mysteriously vanish all over town.
Mona creates a Frankensteinosaurus.
A comic book villain stalks the town; a game takes control of children's lives.
Mona sets about uncovering proof that the new babysitter is, in fact, a robot.
Mona thinks she hears the Swamp Thing; Mona helps Miss Gotto clean her new house.
Mona discovers who is behind recent shark sightings; the cats in town start disappearing.
When Miss Gotto falls ill and is replaced by a substitute, Mona immediately suspects foul play.
Mona must stop a feline invasion; a Wereclown is running amuck in the town.
Principal Shawlby's strange behavior, combined with the paw prints and hair found outside his office, convince Mona he is a werewolf.
A teacher becomes a voodoo victim; underpants haunt a laundromat.
A spirit stalks children's dreams; a childhood nemesis haunts Charlie.
Mona discovers that her father's golf opponent is being helped by a ghost.
Mona discovers that a ventriloquist's dummy is alive. Then, a mysterious limousine causes adults to lose their confidence about going to their high school reunion.
Mona discovers aliens in disguise planning world domination.
Mona goes on a school camping trip.
Mona's inquiry into missing cats leads to Dr. Purrman; Mona and friends the solve shark sightings.