A 'secret' trailer for the first episode of Doctor Who season eight has been released.
Instead of making the teaser available via its Twitter handle, BBC One has encouraged fans to share the footage by retweeting it using #DoctorWho.
The trailer is accompanied by the message: "The new Doctor lands in Victorian London. Share this secret trailer for the first episode of Series 8. #DoctorWho starts Saturday 23rd August on @BBCOne."
Opening with a roaring dinosaur, the promo for the opening episode also features a redecorated TARDIS, which meets the disapproval of Jenna Coleman's Clara.
The season eight begins on BBC One on August 23 and, following the success of last year's 50th anniversary special, the episode will be screened simultaneously in cinemas worldwide, including Ireland.
Here's the trailer: