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In fear of seeing another civilisation self-destruct, Theia uncovers the truth behind Pan\u2019s journey.

An environmental thriller starring Pearl Mackie, Tanya Moodie and Pippa Haywood.

Theme music by Bonobo.

Written by Timothy X Atack.

Director: Becky Ripley

Each episode comes with its own talk and soundscape.

And you can take part in our interactive experiment to see how you respond to sounds of nature at: bbc.co.uk/forest

#Forest404