Having just watched a repeat of this episode, I can truthfully say, I think this where they started to go wrong with the original series.
The two androids Vector and Hector were hilarious, they were just unbelievable. I get the feeling the writer of this episode was having a laugh with them. The actors must have felt like idiots.
It continues the story of them trying to find the route Earth (which they never did in the original 1978 series). The Terrans seems to be from earth, but they always refer to it as Terra. They seem like people escaped from a 1970s disco. And the bad guys (eastern alliance) seem like extras from 1970 musical about the Nazis!
This episode only worth watching for classic value and for die hard fans of the series!