Going to try to stay positive about this episode, but really could have done without the rant at the end. Okay they were wrong, it was Earth all along… If they had not decided the Orphan 55 would be Earth and had made it a planet very similar to Earth they could have gotten the message across just as easily.
I admit that when I saw the cube at the start of the episode I thought it was one of the Hypercube’s Time Lord’s use to communicate. All in all not as good as the previous two episodes.