This series is both brilliant and terrible. It is brilliant in its first run, this is in no small part to the writing of terry nation, by the second series terry nation has departed and the quality suffers accordingly, being somewhat patchy in script and story, also the loss of one of the strongest characters from the first series does not help at all, the third series sees another main character greg, absent until the last two episodes, this awful third series is filled for the most part with gregs common law wife(for want of a better description)whining over greg and scouring the countryside in search of him, as a whole i have to give the series 6 out of ten, but the first series is a good nine.