Isabelle, Phoenix and Oona are on their way to meet Mossy. Baba and Lala want to come too! When the older pufflings get distracted, Baba takes Lala under his wing.

Bernie is washed out to sea on a bit of driftwood while waiting on Bernadette for a date. Oona tries her best to help, but the driftwood is too heavy.

Isabelle is staying with Oona for the night, and Oona wants to impress her with something special. They take a midnight journey to see plankton lighting up the sea.

Oona, Baba and May visit Mossy in the Undergrowth. They discover that a mysterious visitor has been sleeping in his den - and everyone else's dens too! When Oona spots a clue, the friends set out to follow the trail and investigate. Can Detective Oona solve the case and find the culprit?

Phoenix eagerly joins puffin practise with Oona, Isabelle and Baba. They’re practising digging, walking and fishing! Phoenix is very excited to learn, but he doubts himself when he can’t do everything the puffins can. But when the seagulls cause trouble, Phoenix's own talents save the day!

Oona and Baba go to the secret den to shelter from a thunderstorm, where they find Mossy and the Shrew Crew hiding. Mossy admits that he’s afraid of thunder and lightning. Oona encourages Mossy to listen to the music of the storm - the whistling wind, the pattering rain and the booming thunder - and together, they sing the Stormy Song. Maybe thunderstorms aren't so bad after all!

Isabelle and Oona are in a rush today - they are running to the beach to catch a glimpse of a cattle egret. Oona has never seen one before, but Isabelle knows that they're big! While the others hurry along, Baba discovers a whole new small world along the way. Sometimes, it's good to slow down and see the small things - as well as the big ones.

Isabelle and Oona call to see Mossy, only to find him missing. Oona is worried. Flynne hasn't seen him, but she's sure she can find Mossy quicker than the pufflings can. The trio head off, but they’re an unlikely group - it seems puffins and foxes don’t have much in common at all. But when they all work together, they learn that their different skills make them a great team.

Marvin is having a bad, bad day - he has lost his favourite rock. Oona helps him look for another rock, but all the new ones are too small, too heavy or too pointy. It seems like no other rock will do until Oona spots the seagulls with Marvin's old rock. She comes up with a plan to help him get it back!

Mama and Papa are taking Oona and Baba on a family outing to experience something special - Papa tells them it's a big surprise. Oona and Baba are very excited to see it, but they need to find the perfect spot - which isn't easy. In the end, the amazing surprise makes all of their effort worth it.

Double act Phoenix and Mossy are on their way to meet Oona when they find Spiky the hedgehog near the Bat Cave. He's far away from his burrows, and it's getting late. Poor wee fella - he's so small and helpless... they can't leave him on his own. They decide to take him home, but on their way to the Meadow, the friends learn not to judge a book by its very cute cover.

Oona and Isabelle are going fishing, so Bernie volunteers to mind Baba and Lala. The little pufflings are having a great time playing with their ball, and Bernie settles down to watch. When the ball falls into the burrows, Baba and Lala lead Bernie on an underground adventure to find it. There's still life in the old shell yet!

The friends are very excited to stay with Marvin in the Bat Cave - it's going to be so much fun! When they get to the cave, the bats are sound asleep, hibernating for the winter. The friends will have to be very quiet so they don't wake them up... but it's difficult to keep quiet when everyone's playing together.

Baba and Lala have found something very exciting - a great big dandelion puff! When they blow the seeds away, they are very disappointed that there is no more 'fluffy'. Mama spots one seed left, and together, they plant it outside the burrow to watch it grow. Baba and Lala decide to watch over the dandelion until it turns into a 'fluffy' - but they must wait for a long time for a new one to grow.

It's early in the morning, and Isabelle and Oona are off to visit Otto before he goes to bed. Pip and Pop are already fast asleep, but they've taken up all the bedding. Oona, Isabelle and Otto split up to find soft, comfy things for Otto to sleep on. Seagull feathers are the hardest to get, but Isabelle is the best flyer, so she's sure she can do it. But her position as top flyer is challenged by Otto.

Phoenix has picked up a strange, strong smell after playing with Mossy, and nobody knows where it came from. Phoenix needs a swim to wash it off, and on the way to the river, the friends try to figure out what caused the smell. They retrace Phoenix's steps and discover lots of different smells in nature... but which one of them is the right match?

Marvin, Oona and Silky are playing hide-and-seek in the Underwater Cave. Silky tries lots of different hiding places but gets frustrated when Oona and Marvin find her easily. When it's her turn to look for her friends, Silky is too slow on land and is disappointed when she can't find her friends. But when she agrees to play once more, Silky finds a hiding place that's just right for her!

It's a hot day on Puffin Rock, and Oona, May and Marvin want to swim in the pond, but the water has dried up. Even the frogs are gone - all except one, but he's hopping away too. Where is he going? The friends hop along to find out - follow the frog sounds like a fun game! The frog leads them all over the island. Will they be able to keep up with him and find his friends?

Oona and Baba plan a surprise for Mama and Papa - they're going to collect some lovely, bright flowers for them! Baba comes across a honey bee in the meadow. Wherever bees are, there will be flowers, because they know where the best ones are! Oona, Baba and the bees find lots of beautiful flowers, but when they get to the Undergrowth, the pufflings see more bees than they bargained for.

Baba can't wait for his swimming lesson, and he has a great instructor - his big sister Oona. Oona teaches Baba to paddle, steer with his feet, and put his head under the water. With some practise, and encouragement from Oona and Mama, Baba starts to get the hang of it - but diving proves much more difficult... until Lala drops a shiny shell in the water.

Baba isn't feeling well, and he needs to rest in the burrow. Oona has an idea to make him feel better. She travels across the island asking their friends to help her with her plan. They're going to bring Baba all his favourite things to help him feel better! Oona begins to doubt herself when it seems like Baba's not so interested in his favourite things - until their friends arrive!