This is a really solid set-up for the finale of Series Two and just a fun, interesting episode all around.

My favourite part of Army of Ghosts, by far, is the way we are almost casually introduced to the topic. Rose and the Doctor stop by the Tyler home, only for everyone to go "well, it's ghost time," and some ghosts start roaming around. We're at a point where this has happened enough that the surprise and even the novelty of it has largely worn off to everyone but our main characters (and us, the audience). It's a really fun way to introduce the mystery and they only build up on things here.

Where as series one loved to drop hints through the mystery phrase of "Bad Wolf," series two has been using "Torchwood" and that starts to get paid off here. I'll admit it isn't quite as strong as the feeling of pay-off I got out of Bad Wolf, but the way Torchwood has been built up until now as something at the very least antagonistic, only for them to mostly be courteous to the Doctor at first and even clearly admiring him - it's good writing. It adds a lot of tension and builds up on all this mystery.

And then we start getting reveals that really surprised me. The Cybermen were something I really didn't see coming and while it is a sharp turn from the direction the plot seemed to be heading to at first it still really worked for me. I just really like the writing of this episode and that goes right up to the end when we have that big final reveal of the Daleks. A really strong episode overall, largely held back only by some of the special effects not looking great. The ghosts just aren't anything special looking and some of the other stuff looks clearly fake, even by the standards of television that's pretty old by now.\