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Can Clara and the Doctor see the wood from the trees.

Teaser
The Doctor discovers that the final days of humanity have arrived.

DRAMA So London, indeed the world, wakes up to find that the trees have moved back in overnight. "The forest is mankind's nightmare," the Doctor tells Clara and Danny, who are trapped in the capital with their Year Eight Gifted and Talented Group (an impressive set of child actors).

Frank Cottrell-Boyce has written a delightful fable that taps into our primal fears, but if you're an ecologist, into Gaia theory or simply have poetry in your soul, In the Forest of the Night will give you a glow. It alludes to William Blake's The Tyger (it's almost the second line) and makes other poetic references. Clara's troubled pupil Maebh Arden (excellent Abigail Eames) is perhaps a nod to Shakespeare's mother Mary Arden and surely named after England's ancient forest. Like Blake's opaque poem, this episode is open to interpretation.

WHO IS FRANK COTTRELL_BOYCE?

• The writer of tonight's Doctor Who (8.20pm, BBC1), Cottrell-Boyce was born in Liverpool. His big break came in the early 90s when he joined the Coronation Street writing team.
• As well as writing children's books, he was recruited by Danny Boyle to write the London 2012 Olympic Opening Ceremony.
• He has worked with Michael Winterbottom on six films including Welcome to Sarajevo and 24 Hour Party People. He also wrote the screenplay for The Railway Man starring Nicole Kidman.