The Problem For about forty minutes, The Power Of Three is excellent. The slow invasion is a strong concept, UNIT are given a solid revamp, and its jam packed with good character moments. The problem is the last five minutes. The Shakris plan starts in force, the action shifts to their ship and the Doctor solves everything in seconds with a quick twirl of the Sonic Screwdriver. We never even see a real Shakri. Just a pre-programmed hologram of one, completely wasting Steven Berkoffs performance. Its a supremely rushed and lazy ending that completely drags down the rest of the episode. How To Fix It Make it a two-parter. Thats all it needs. Disregarding the last five minutes, it feels like its the first of two episodes. And it seriously needs a second episode since the way the slow invasion is written is as a story of two halves. First comes the months upon months of waiting; allowing for character development between the Doctor and the Ponds before their final episode, and to whet the viewers appetites for an action packed resolution. It would also allow for a deeper exploration of the Shakris reasons for wanting to wipe out the human race and provide a chance to actually show them in the flesh instead of a recording, giving the Doctor something tangible to play off and act against. It would also remove the need for such a ridiculously swift resolution to the worldwide series of heart attacks caused by the Shakris cubes.