A really frustrating Story. There are some fascinating Ideas done with the relationships between Humans and Androids, tricking Charley thinking she is an Android gives us some of the best Elements of the Story, her Conversation with somebody who admits he doesn't know what to do next, is terrific! And yet.. This Story is a bit cowardly overall, there are some big decisions made, but all those reverted with a Twist or two. I know it's Doctor Who and some of those Things are rather dark/bleak, but then I may have to ask: "Why present it this way if you don't commit to the Bit?" Maybe I am not articulating it too well, but this Story ends up playing it too safe, when it had the Potential to be genuinely great.