In spite of all the rumours buzzing around the 'net, it was difficult to tell WHO was playing Davros..and nothing in the credits at the end either.
One surprise (for me anyway) was the Doctor regenerating at the end of the episode - what does that mean? ..and WHO does that mean?
I thought some of the special effects were a little below par - the tardis in space and spaceships flying over the houses for example.
Other than that, a really really, REALLY gripping episode and I can't wait for the season finale next week!