Huckle and the gang investigate strange voices in Busytown Museum. / A smoke alarm keeps going off for no reason, and the gang tries to figure out why.
The kids' sandcastle gets trampled overnight; Huckle and gang are determined to find out how it happened. / Huckle, Sally, and Lowly discover a set of ski tracks that run on either side of a tall tree.
Huckle and gang search for the owner of a mysterious sketchbook. / Huckle and gang investigate a strange temperature drop which turns Busytown's summer to winter.
When coupons for free cookies fail to arrive in the mail, Huckle and the gang are determined to find out why. / A model boat is mysteriously broken, and Huckle, Lowly, and Sally set out to discover how it happened.
Huckle, Lowly, and Sally set out to discover why all their mini putt balls are disappearing. / When the gold coins Mr. Fix-It finds on the beach disappear, Huckle, Lowly, and Sally set out to find out where they went.
Huckle and gang are determined to find out why Sally's yellow t-shirt mysteriously turned green. / The kids discover pieces of a large metal hand; Huckle and gang are determined to find out to whom they belong.
Someone in Busytown Park got rid of Sally and Hilda's newly drawn hopscotch board. Huckle and Lowly set about helping the girls find out who's responsible. / A treasure is hidden somewhere in Mr. Gronkle's mansion. All anyone knows is that the secret hiding place has something to do with a rooster, an arrow and the number four.
When a giant circle appears in the middle of a corn field, Pig Will and Pig Won't are convinced it's an alien landing site. / When flying potatoes are dropping from the sky in Busytown, Huckle and gang are determined to find out why.
Someone is painting red spots on all sorts of things in Busytown. / A tiny piano motivates Huckle, Sally, and Lowly to try to figure out who would own such a small instrument.
Mayor Fox has misplaced the giant key to the city that he's supposed to be presenting to a visiting astronaut. Huckle and his pals try to figure out where he set it down. / A couple of Busytown residents are confounded by mysterious knocking at their doors. Huckle and his mystery-solving team attempt to find out who it is, but they're eluded at every turn.
When Pig Will and Pig Won't discover a puddle full of stranded goldfish, Huckle and his pals try to figure out how they got there. / A mysterious message on Sgt. Murphy's radio has Huckle and the gang baffled.
The kids find some numbered papers blowing around the park. Huckle and the gang are determined to find out where they came from.When all the milk in Huckle's Dad's store turns out to be sour, Huckle, Sally and Lowly set out to find out why.
When the pizza delivery is unusually late, Huckle and the gang set out to find out why. / "Fairy dust" and strange sightings has Hilda Hippo convinced that fairies are real and living in the Busytown woods.
The contents of a lost bag lead Huckle, Lowly, and Sally to the Busytown Opera. / Cyclists are getting flat tires somewhere in Busytown and Huckle and the gang are determined to find out where.
Huckle, Sally, and Lowly search Busytown looking for a lock that fits an old key they've found. / Chocolate sauce on Lowly's car leaves Huckle and the gang puzzled.
Hilda gets a sneezing fit whenever she comes near Sally, leaving Huckle and the gang puzzled. / Huckle, Lowly, and Sally are stumped when things start disappearing in the blink of an eye.
When newspapers, then cardboard boxes, then plastic pails disappear from porches and sidewalks, Huckle, Sally, and Lowly set out to figure out what the connection is. / Huckle, Lowly, and Sally happen upon a huge tooth and can't imagine anyone in Busytown big enough to own it.
Huckle, Sally, and Lowly find a piece of metal with a big number 10 on it and set out to uncover what it is. / Huckle and pals set out to find the whistle blower who is causing a traffic jam.
Huckle and his friends all receive party invitations, but the party's location is a mystery. / Huckle and his pals discover a mysterious gigantic spoon and bowl.
A series of strange incidents and a whoop whoop whoop sound has Pig Will and Pig Won't convinced a hungry bat is loose in Busytown! / The mysterious disappearance of Mayor Fox leaves Huckle and the gang on an important search.
Pig Will and Pig Won't convinced that there is a spaceman in Granny Goodpig's apple orchard. / Someone took all the red roses from Granny Goat's garden leaving Huckle and gang puzzled.
When Busytown citizens are falling asleep in the middle of the day, Huckle and gang set out to find out why. / Someone has taken Huckle's car and left their car in its place.
A nameplate about to be put on the statue of Admiral Hornblast goes missing and Huckle, Sally, and Lowly try to uncover what happened to it. / Pig Will and Pig Won't are playing spies. However, Pig Won't suddenly finds himself out of the game when his Secret Spy Ring disappears.
