I personally found the cyborgs stretched credulity a bit. They just seemed completely out of context. I mean, they appeared out of nowhere for the one episode and then - whoosh! - that's the last we see or hear of them. Basically, the seem to have been no more than a plot device. Perhaps you're right, Croft Storm. Maybe they were meant to feature in season six, but since that season never happened it hardly makes much difference, does it?