The BBC have finally released the official story synopsis for Deep Breath, the opening episode of Series 8.

When the Doctor arrives in Victorian London, he finds a dinosaur rampant in the Thames and a spate of deadly spontaneous combustions. Who is the new Doctor and will Clara’s friendship survive as they embark on a terrifying mission into the heart of an alien conspiracy? The Doctor has changed. It’s time you knew him.

It airs Saturday 23 August on BBC One with the time still to be confirmed.