A giant wooden apple on the fruit store sign falls off and no one knows where it went.

When Mr Frumble's newly painted green Pickle Car mysteriously disappears, Huckle determines he will find it and solve the Mystery of the Pickle Car Puzzle.

When Huckle, Lowly and Sally discover a missing wheel by the roadside, Huckle determines he will solve the Mystery of the Missing Wheel by figuring out what the wheel is missing from.

Several Busytown characters are dismayed to discover blue paint stains on the back of their clothing.

When a lost parrot shows up at the park, Huckle and Lowly decide to find its owner.

When the gang find strange footprints, Sally fears they were made by a monster.

Two identical tanker trucks pull into Gramps Gas Station at the same time. Shortly after, Huckle and his pals notice cars spewing bubbles and conking out.

Huckle, Lowly and Sally find an abandoned egg in the park. They search for a nest that has similar-looking eggs.

Regardless of Hilda Hippo's photo of a ghost in the mansion by the lighthouse, Huckle sets out to prove there are no such thing as ghosts.

A sign directing customers to a sweet corn stand comes loose and swings upside down so the arrow points the opposite way.

Glue creates a sticky situation in Busytown.

Pig Won't and a hundred helium balloons disappear.

Hilda's fresh-baked muffins mysteriously disappear.

The gang try to determine why someone is knocking over stacks of cans in Mr. Cat's shop.

Huckle, Lowly and Sally's science project vanishes from inside a locked room.

Huckle helps Sally track down her missing scooter.

Using clues found in the litter, Huckle hunts down a litterbug.

The gang sets out to prove that Busytown is not being invaded by giant robots.

Huckle and his friends search for missing Junior Monkey.

Huckle and his pals join a secret club.

Huckle, Lowly and Sally must figure out why playground items keep disappearing.

The Busytown clocks go crazy.

Something takes a big bite out of the Mouse family's cheese car.

Huckle and his friends search for the hero who rescued Granny Goat.

Huckle, Lowly and Sally are determined to find out why every loaf of bread in Busytown is as hard as concrete.

Twisty road lines create a traffic problem.

Someone takes drastic measures to stop the noisy squeaks in Busytown.

Huckle and his friends return an unfinished portrait to the artist who lost it.

Huckle and his friends return an unfinished portrait to the artist who lost it.

A statue made of butter disappears from the Busytown Museum.

A trapeze artist's tiara disappears.

Huckle and his pals help Mr. Frumble find his prized postage stamp.

Lowly and Sally team up to decipher a mysterious bank note's meaning.

Huckle and his friends find a tiny flying saucer.

Huckle, Lowly and Sally help Postman Pig deliver a letter with a smudged address.

The gang finds a wrapped gift without a name tag.

A cherry tree mysteriously drops all of its fruit.

Huckle and his pals search for a dragon on the loose.

When they find their favorite swimming hole empty, Huckle, Lowly and Sally set out to find out where the water went.

The gang helps the Busytown firefighters find their missing hose.

Everything in the Raccoon family's house disappears.

Huckle and his pals try to figure out why things made of metal are flying around Busytown.

When a popular pizzeria closes, the reason for it is a mystery.

Pig Will and Pig Won't believe that a scarecrow is after them.

Lowly's pals help him find his missing apple car

Huckle, Lowly and Sally try to uncover why strange stains are appearing.

Huckle, Sally and Lowly race to figure out who owns eight shoes.

A mysterious creature is in the woods.

Sally, Huckle and Lowly investigate a mysterious smudged signature in a library book

A shipment of books goes missing.

Someone who can jump high puts advertising stickers everywhere.

A snowman appears on a summer day.

The gang investigates strange voices in Busytown Museum.

Huckle wants to find out why a smoke alarm keeps going off but there is no fire.

The kids' sand castle gets trampled overnight.

A set of ski tracks runs on either side of a tree.

The gang searches for the owner of a mysterious sketchbook.

A strange temperature drop turns Busytown's summer into winter.

The gang is determined to find out why coupons for free cookies fail to arrive in the mail.

A model boat is mysteriously broken.

Huckle and his pals help Baby Sadie find her lost doll.

The gang wants to find out why cars are disappearing from a parking space.

Huckle, Lowly and Sally set out to discover why their mini putt balls are disappearing.

Gold coins Mr. Fix It found on the beach disappear.

The gang tries to find out why Sally's yellow T-shirt has mysteriously turned green.

The children discover pieces of a large metal hand.

Photographs on a lost camera help Huckle and his pals find the camera's rightful owner.

A jellybean list made by Sally disappears.

Huckle and the gang search for a priceless treasure hidden somewhere.

Huckle and the gang search for a priceless treasure hidden somewhere.

Lowly is convinced there is a monster loose in Busytown Lake.

Huckle and his pals try to track down a bad driver.

A giant circle appears in the middle of a cornfield.

Potatoes drop from the sky in Busytown.

The gang sets out to find out who is painting red spots throughout Busytown-

Huckle and Sally and Lowly try to figure out who would own a tiny piano.

Huckle and his pals help Mayor Fox find the ceremonial key to Busytown.

The gang searches for the person who is knocking on doors.

Huckle and the gang are puzzled by a puddle full of goldfish.

Sgt. Murphy's radio receives a mysterious message.

The gang finds numbered papers blowing around the park.

The milk in the store Father Cat runs is sour.

Huckle and the gang try to figure out why their pizza delivery is unusually late.

Hilda Hippo thinks there are real fairies in Busytown woods.

A lost bag is discovered.

Huckle, Lowly and Sally investigate when flat tires of Busytown cars happen everywhere.

Sally, Huckle and Lowly look for the lock that fits the old key they've found.

Huckle and the gang are puzzled when they find chocolate sauce on Lowly's apple car.

Ginormous sneezes come from Hilda when she gets into Sally.

Lowly and Sally try to figure out why laundry keeps disappearing.

The gang investigates when the newspaper does not show up at the houses.

Huckle, Sally and Lowly find a huge tooth.

Huckle, Lowly and Sally investigate a strange discovery of a big number 10.

Huckle and friends try to determine who is causing a traffic jam.

Mysterious party invitations are sent out.

A gigantic spoon is discovered.

Strange incidents and sounds make Pig Will and Pig Won't think a hungry bat is on the loose.

Mayor Fox mysteriously disappears.

A spaceman suddenly appears in the Busytown apple orchard.

Someone has taken all the red roses from Granny Goat's garden.

Busytown citizens fall asleep during the day.

Someone switches Huckle's car with another.

A nameplate about to be put on a statue of Admiral Hornblast goes missing.

Pig Won't's secret spy ring disappears.