Filming on the 50th anniversary is continuing today in Cardiff. As usual, spoilerphobes may want to avoid.
The first picture of David Tennant and Matt Smith together in costume has been captured. Along with a Zygon in the background.
David Tennant and Joanna Page run away from the Zygons.
John Hurt in costume:
Tennant between filming.
Joanna Page in costume:
Gallery by BBCfangirl.