The friends set off in the train for Craggy Peak, so that Zuzu can learn mountain climbing. En route they meet Maudie, an elderly mountain goat who helps them trick Musical Mike, the obstructive Singing Train Controller (Egbert), and who proves surprisingly nimble and not at all frail and deaf as they had supposed.

Alma wants to make an exciting movie with her new underwater camera, so Poppy and the gang take the plane to the Great Coral Reef near Seahorse Island, where they meet a sea turtle named Belinda.

After Zuzu finds a baby parrot in a bush, the gang head to Parrot Tropics to return him home. Everyone but Zuzu thinks it hilarious that little 'Zuza' imitates his every word, as if Zuzu were his elder brother. But when Zuzu gets stuck in mud in the jungle, he is very glad that Zuza is there to add his cries for help to his own.

Everyone is surprised when Poppy reveals that she is an expert flautist. Accompanied by Alma, Mo and Zuzu, she takes a trip in the balloon to Musical Marsh, where the reeds grow into flutes. Unfortunately, they are distracted on the way, and by the time they arrive everyone is too tired to take any lessons.

After Owl and Alma simultaneously spot a new comet in the night sky, the friends set off in the rocket for Library Planet. Byron the Librarian, an officious ostrich, is in charge of recording all new comets, which are named after the discoverer – but Owl doesn't want to share the credit with Alma.

After Alma scrapes her arm, Poppy puts a plaster on it and everyone sets off to Giggle Pond to visit Owl's friend, Dr. Billy and put a bandage on her arm. Alma thinks that it will hurt when the plaster is removed, but Dr. Billy persuades her to go for a swim in the Giggle Pond with the others. Soon she is giggling so much that she doesn't even notice when Dr. Billy removes the plaster and puts a bandage on her.

When Mo finds a room key to the Iceberg Hotel, the friends fly to the Great Northern Iceberg to return it. They arrive, to find the place deserted except for Charlie Chapped-Beak, Penguin Waiter (Egbert) and Mikey, a polar bear cub who has become separated from his dad.

After Owl loses a sock, the gang set off for Laundry Lagoon, where all missing laundry turns up. Zuzu is not very enthusiastic, but when he is put in charge of bringing organisation to the chaos that they encounter, he realises that a bit of hard work can be fun after all.

While the friends are enjoying Poppy's homemade noodles, Zuzu tells them that his wooden racing car didn't win in the Scout's racing derby. Poppy suggests that he should test it first, like she did with the noodles, and takes them all off to Noodle Land, where there's a miniature track made out of noodles.

Ravi the Tiger invites the friends to enter a sand sculpture contest on the beach at Purple Sands. Zuzu and Alma both want to win, but there is strong competition from Parsa, a small sea turtle. When Ravi asks Poppy and Mo to help with the judging, Mo is reluctant to choose between his friends.

Zuzu needs waterproof ink to make a sign for Alma's flowerbed, so the friends take the submarine to look for the legendary Great Squid of Mystery, who lives in the Secret Sea.

Brown Bear gives Poppy a present of a toy teddy bear. When she sees that it has a frown on his face, Poppy realises that her friend must be sad and takes the gang out in the campervan to find Brown Bear and cheer him up. Poppy has time to tell a tall story before her friend lies down to sleep for the winter.

Mo discovers what it is like to be taller when he gets a new pair of stilts. Poppy takes the gang to the Land of Unusual Sizes, where they meet a tiny gorilla called Davy and a giant squirrel called Bob, but run into a spot of bother in the shape of Egbert, disguised as the Stomping Giant.

Alma surprises her friends when she reveals that she believes in fairies and has made a small house for them. The friends head into the Enchanted Woods, where Alma hopes to meet a real fairy - but what they will find there?

Poppy Cat and his friends fly to Gloopy Ponds for some soothing mud to cure Zuzu's itch. But Rock Twinkletoes, the disco geologist (Egbert in disguise), has his eye on Zuzu's great-great-great-grandfather's prize 'gold' medallion...

When Owl runs out of cocoa for his morning hot drink, the friends take a train to 'Chocolate Falls', where they meet Roland, a lonely turtle who has some bad news for them.

Alma is discouraged by her meager carrot patch, so Owl suggests that they visit Fantastic Gardens, where vegetables grow as big as trees.

Discouraged by his small size, Mo finds a giant toothbrush on the ground and decides it must have come from a whale. Poppy suggests they head for the sea to find the owner.

After arguing over the rules to a game, Alma and Zuzu refuse to speak. Poppy suggests that they search for special olives which, when squeezed over people, make them friends again.

When Owl is grumpy because his tree is so small, Mo reveals an acorn which he and Alma hope to plant for a new tree for Owl; but Poppy suggests they head off in the horse and carriage to the Fast-Growing Forest.

When Zuzu shows up wearing a hand-knitted sweater that Alma made, everyone admires it so much that Alma offers to make them all sweaters.

Poppy and friends are carving pumpkin lanterns when Owl reveals that Halloween is his favorite holiday and invites them to Halloween Woods in costume by train (with Poppy dressed as a cowgirl, Alma dressed as a fairy, Zuzu dressed as a pirate, Owl dressed as a wizard and Mo dressed as a skeleton) where they meet a bat named Basil.

Alma brings a jigsaw puzzle for the group to assemble, but when they discover a piece is missing, the friends head out in the horse and carriage for Jigsaw Castle, where lost puzzle pieces are said to show up.

Alma finds one pretty shoe, but when Owl identifies it as a dancing shoe from Polka Plains, it's decided the shoe should be returned to its owner, and the gang set off in the airplane.

Hilary the hedgehog has not been able to hibernate and her snoring is keeping Mo awake and making the little mouse grumpy. Can the gang find a soft place for Hilary to sleep?