Filming on location has been taking place just north of Almeria in a place called Oaseys Theme Park, which is an area set up to look like the old American West and has been used for numerous films in the past.
Casting confirmed for the episode included Ben Browder, known to many for his role in Farscape, Rob Cavazos, Dominic Kemp and Adrian Scarborough, start of Upstairs Downstairs, Miranda and Gavin and Stacey.
Not much is known about what characters they will play but Scarborough and Kemp have listed on their CVs the names Kahler Jax and Kahler Mas respectively.
If you were hanging around our Forum yesterday then you may have seen some of the updates from this weeks filming in Spain. A full collection can be seen on the forum, but a sample few are below.
For more season 7 information and regular updates, be sure to check out The Doctor In The TARDIS Forum