This is definitely one of the stronger episodes from season three. Well acted and emotional. The Aliens themselves are well represented and make a refreshing change from the usual rubber masks. However (and I thought this back in 1973 when I first saw the episode) it is let down slightly because the aliens have silly voices and are poorly scripted.
Hence they lacked credibility - perhaps it would have been far better to have left them silent with the ship being in 'time jeopardy' inferred from the electronic cage that was being generated.
Such a pity they weren't given more money for the final series - just think if the series had continued it would have begun to have got the benefit of better special effects pioneered by 2001: A Space Odessey. But then I suppose it might have lost some of it's charm and perhaps not become a cult series (heaven forbid)
Hence they lacked credibility - perhaps it would have been far better to have left them silent with the ship being in 'time jeopardy' inferred from the electronic cage that was being generated.
Such a pity they weren't given more money for the final series - just think if the series had continued it would have begun to have got the benefit of better special effects pioneered by 2001: A Space Odessey. But then I suppose it might have lost some of it's charm and perhaps not become a cult series (heaven forbid)