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.