Mia shows Oskar her hand-drawn comic book when a new girl, Tilly joins in. Mia takes them to the fantastic world in her book where they explore and find new friends Rainbow Guy, Beetroot Girl, the Leafthings and Nice Cream Bear.
When Mia, Oskar and Tilly cannot find anywhere to play they decide to go and build their very own playhouse. Ice Cream Bear and the Leafthings help with Rainbow Guy bringing the colour, of course.
Tilly gets very excited about playing superheroes. Mia, Oskar and Tilly all go to see what a superhero like Beetroot Girl is doing. They each explore ways of using their own superpowers to help save Watermelon Cat who is cat stuck up a tree.
Tilly won’t stop soaking Mia and Oskar by splashing in puddles. Soon they are all underwater where they meet Octobubbly. He is in fits of laughter blowing bubbles everywhere.
Oskar is bored and it seems nothing Mia and Tilly suggest can cheer him up. Eventually Mia and Tilly persuade Oskar to go with them to a fairground but it is only when they meet Nice Cream Bear does Oskar see that his bad mood has been ruining Mia and Tilly’s fun.
Mia, Oskar and Tilly are on a treasure hunt when Tilly mysteriously disappears, has she taken the treasure chest of sweets? With the help of Nice Cream Bear Mia and Oskar find Tilly, the treasure and Mrs Drago the friendly dragon deep in the forest.
Mia is on the swings with Tilly and Oskar when her wobbly tooth suddenly falls out. Mia discovers a timid Gumbelina has ended up with the tooth, but she keeps running away!
The children want to join a football game but the big boys say no because they're too small. So undaunted they go to the forest to play with the little Football Nuts but the big SoccerSauruses storm in and ruin it.
Tilly is excited about her new pet dragonfly but just when they all go in search of a friend for her pet the dragonfly escapes and the tables are turned as a giant bee called Bee Bop has his own ideas of who he would like as pets!
Mia, Oskar and Tilly decide to play house and find some newly hatched chicks to look after. It's Tilly's turn to play Mummy but she doesn't want Mia and Oskar's help. Before long though, its chaos and the chicks are running everywhere.
When there just isn't enough time for playing, Mia, Tilly & Oskar enlist the help of Buckley - a genie in a bucket. Buckley grants them 3 wishes and they choose to stop the clock so that time is endless.
Tilly is so excited about playing Whirley Ball but there are no rules, until the children start to make them up. Nice Cream Bear plays too and even Octobubbly joins in with his tentacles producing a real tangle.
Oskar is showing off his knowledge about space in the playground. The children adventure off to the moon to find out more with moon.
Mia is a fast runner and challenges them all to a race but thinks Tilly is pretending to lose. A competitive Rainbow Guy finds them in the forest and asks to race.
Mia, Tilly and Oskar meet Max, a new kid in the playground but Oskar isn’t very kind. When they go off to space for an exciting adventure across the Milky Way Oskar shows off.
Mia is upset when she realises her favourite climbing frame has been taken down. In the forest she finds NCB wants his old shoes back but they keep running away.
Mia and Tilly are excited about pretending to be puppy dogs, but Oskar wants to build a sandcastle instead. So Mia and Tilly run into the forest barking like puppies and bump into Smarty the Lighthouse who has lost her lightbulb.
Mia is torn between Oskar and Tilly. They both want her to play different things at the same time. Mia tries to please them by running between skipping in the forest with Tilly and space with Oskar.
The ball the children are playing with in mysteriously bursts. What could have done it? Off to space they go to find out what it could have been but Oskar is acting a little strange.
So they go to a new world without him. It’s a topsy turvy world of opposites and they have lots of fun discovering what happens there. Oskar can't join in without imagining its real but as Oskar loves logic and facts its not easy.
Tilly wants to play with her radio controlled car, but the others don't have cars. Instead Mia and Oskar have fun with some friendly racing snails they find. Suddenly Tilly challenges them to a race in her Monster Truck.
The kids are excited by Oskar 's digital tablet. On the moon Oskar only wants to watch his Robo Carrot tablet, but Mia wants to play. When Beetroot Girl leaves Mia in charge of her Asteroid bunnies havoc starts.
Oskar and Tilly are playing with a frisbee when it knocks Mia into a garbage can. Mia starts to collect the litter, but without any help from Oskar or Tilly.
Mia, Tilly and Oskar want to put on a song and dance show but deciding what to do is tricky. It’s Mia who takes the lead but when she hurts her leg Tilly and Oskar are left to rehearse.