Moominsummer Madness

A nearby volcano causes a massive wave to flood Moominvalley. While escaping the flood, the Moomin family and their friends find a building floating past, and take up residence there.

They believe it is a deserted house until they realise someone else lives there, Emma, who explains that it is not a house but a theatre. The moomins start to understand about the scenery, props, and costumes they have found.