Dad's favourite record won't play anymore, so Cosima and Big Lizard secretly plan to learn the song and surprise him. However, they have trouble recruiting a drummer.

Big Lizard and Cosima create a fantastic water ride when they dislodge an underwater rock blocking a volcanic vent. It's all good fun until they realise the sea is starting to change.

When all the vegetables from their garden are stolen, detectives Cosima and Big Lizard investigate all over the neighbourhood - only to return to the scene of the crime!