PC Plum is determined to perform Great-Granny Plum's song at the Balamory ceilidh all by himself, but he soon realises it isn't easy being a one-man band.
When Dr Ollie discovers the Story Bus is delayed, he vows to save the day by inventing a new story to tell Miss Hoolie and the children.
With the harbour master away, Penny Pocket tends to his beloved pet plant, Colin - she must get him better!
Ava's solar gadgets malfunction, making her doubt her skills. But with PC Plum's encouragement, she realises that each invention needs a different-sized solar panel.
PC Plum jumps to conclusions when he hears about an upcoming volcanic eruption. But little does he know, it's Ava's science project that's set to fizzle in a safe experiment.
On Big Fix day, Ava's Good-As-New machine repairs everything - even things that don't need mending. But when it fails, she has to find another way to fix the children's toys.
Penny brings a dinosaur fossil to the nursery, while Bonnie and Hamish plan a secret dino dance. But mysterious footprints have Penny wondering if there's a real dino on the island.
PC Plum uses Ava's doubling machine by mistake, doubling all his recycling. But with Dr Ollie's help, it becomes Cyclo the Recycling Robot, giving the children lots of fun.
Dr Ollie forgets who he asked to play the wizard in his play! Ava's memory-jogging machine helps him recall, but things get confusing at the nursery.
Miss Hoolie is planning a cycling holiday around Balamory, but her old bike needs serious TLC. Ava offers to fix it, but a few small repairs turn into a much bigger challenge.
