Willow, Whyla and Wes need to find out why kangaroos have pouches. Along the way, their quokka pals Quinton, Quidget and Quest learn they have something in common with kangaroos - they're all marsupials.

Willow, Whyla and Wes face their snappiest question yet as they try to find out why crocodiles like sitting in the sun. With the help of Quinton, Quidget and Quest, the gang are soon uncovering unbelievable reptile facts.

As Willow trains for her first fun run, the gang searches for facts about Australia's biggest flightless bird - the emu. But can Quidget, Quinton and Quest help find out why this bird can't fly, in time for Willow's run?

The gang need to discover why the sea is salty. But first they have to find out where all the water in the sea comes from. Meanwhile, Wes works on a plan to add fun to his favourite slushy juices.

The quokkas' snacks have gone missing, leaving Quinton, Quidget and Quest feeling hungry - and sleepy. The gang need to use all their fact-finding skills to help their quokka pals as well as discovering why koalas are so sleepy.

Quest's first ever tooth falls out while she's eating a leaf snack and now she can't find it. Willow, Wes and Whyla try to find Quest's lost tooth while learning whether sharks' teeth fall out too.

Willow, Whyla and Wes return from holidays to their trickiest question ever: can you see the Great Barrier Reef from space? Only a special intergalactic journey from Quest and a special invention from Quidget will help find the answer.

Whyla is planning an extra spooky party when a question comes in about bats. Can the gang find out how bats fly in the dark before party time?

It's Quest's birthday and the gang are planning a surprise party. But can Willow, Wes and Whyla keep the party secret while they try to find out why Australia looks red from the moon?

Willow, Whyla and Wes face their prickliest question ever: are echidnas born with spikes or do they grow them later? With the help of Quidget's tiny camera and Quest's exploring expertise, they just might uncover the answer.

Quidget wants to invent a tasty new dessert, but when his first recipes taste strange, he needs to think up a new idea. Luckily, a question about whether it snows in Australia might give him the inspiration he's looking for.

Willow, Whyla and Wes search for facts about one of the most wondrous creatures in the creek: the platypus. Their quokka pals help them discover how the platypus uses its duckbill, and Whyla sets Wes skill-testing challenges.

When Quidget invents a robot dog, Wes wants a pet of his own. But when the gang tries to find out what gives Blue Heeler dogs their special coloured fur, Wes discovers that owning a pet is a big responsibility.

Quest heads to the rainforest to help Willow, Whyla and Wes find out why there are so many insects there. Meanwhile, Quidget and Whyla try help Wes overcome a big problem. Could Quidget's shrink ray invention be the answer?

Quinton is excited to enter a sculpture-building competition at the beach. But his first attempt doesn't go to plan. Can the gang help Quinton build his sculpture in time - and work out what sand is made of?

The gang search for reptile facts to help them discover Australia's biggest lizard. But the answer might be bigger - and older - than they expected. Could the final clue be hiding in a file in Quinton's library?

Wes' fabulous new dessert is frozen solid, thanks to an accidental blast from Quidget's latest invention. As the gang try to find out how ice melts, Wes realises that his solution might be closer than he thinks.

Willow, Whyla and Wes need to find out why kookaburras laugh. Is it because they love telling each other jokes? Maybe Quest's recordings of kookaburras will help them find the facts they need.

Willow, Whyla and Wes face their fishiest question so far: are jellyfish really fish? Quest heads to the ocean to find the answer. But can Wes come up with the perfect idea for a dessert that's delicious and super healthy?

It's the shiniest question yet as the gang try to find out where gold comes from. When Wes discovers a secret pirate treasure map, he teams up with Quinton to search for the hidden gold.

Something fishy is going on as the gang try to discover why fish swim in schools. First, they need to find out what a fish school is and whether they have classrooms. Meanwhile, Wes tries to design the perfect backpack.

The gang need extra help from their quokka pals to answer a slippery question: why do snakes shed their skin? As they piece together the clues, they try to work out why Willow has suddenly grow out of her clothes.

As the gang get ready for their sports carnival, they try to find out how insects walk up walls. Their quokka pals help them discover all the special skills insects use to defy gravity.

The Wonder Gang love penguins, but they need to find out if they are waterproof. They enlist Quidget's help to work out what being waterproof means. A chance discovery by Quest out in the field might hold the answer.

Whyla can't work out why her new plant isn't growing and enlists Quinton's help while the gang try to find out how plants grow in the desert. The answer might be found in the Great Sandy Desert, so Quest heads out to explore.

Wes thinks the gang could have their easiest question yet: what is coral? But they quickly discover that although it looks like a plant, coral is unlike any other living thing on Earth.

The gang face a question 8 times bigger than anything they've answered before: why does an octopus have 8 arms? With the help of their quokka pals, they soon discover that octopuses are one of the most unusual creatures in the ocean.

Willow and Quidget are busy working on a surprise new feature for Quest's Q-pod when an unexpected question bounces in to Wonder HQ: how do kangaroos jump?

When the gang discover that Quidget's grandma buried a time capsule at Wonder HQ, Wes helps him dig it up but they need something stronger than a spade. Maybe the answer lies in their latest question: why do wombats dig?

Wes thinks he knows the answer to the gang's latest question: why do blue tongue lizards have blue tongues? When an experiment leads them down an unexpected path, it's a rush to find the answer in time for a special event.

Willow packs for coding camp when a question comes in: Why do cicadas have shells? The gang discovers that not only are cicadas amazing insects, but they might also help Willow work out exactly what she needs to take to camp.

Whyla prepares for a beach trip when a question comes in about sea turtles. Can the gang find out why these amazing creatures lay their eggs in the sand? A special photo taken by Quest might just hold the answer.

It's raining on the day of the gang's long-awaited wonder walk. But Wes is not about to let a bit of wet weather spoil their plans for a fun day out. Could the answer be hidden in their latest question: why are frogs so slimy?

The gang prepare for their annual hide and seek contest. But Wes' winning streak might be over - unless he can think of the perfect hiding spot, fast. He looks for a solution while they find out why rainbow lorikeets are so colourful.

The gang plan a big party to celebrate their quokka pals for Quokka Day. While the gang try to find out if quokkas and kangaroos are cousins, Quinton tries to find the courage to fulfil his dream: to fly Quest's Q-pod all by himself.