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!