The plot is basically a rip-off of Claws of Axos; Yates, who at this point in continuity has only just arrived at UNIT, keeps emoting about how it is his only real home and then has to have most of the story explained to him, including the parts that were blindingly obvious. I'm prejudiced, as I'm not a fan of Yates or Franklin, and I will admit that there is one glorious image of the Third Doctor's face revealed in crop circles, but on the whole I think this one is skippable. ( )