The Keeper is your average standard Blake's 7, good but not great. It is, though, only a build-up for what follows it, the classic "Star One". The whole of the first 2 series had been building up to this point, where Blake and crew think they can finally defeat the federation in one go. But they dont reckon on Travis and his new "friends". The last 10 minutes of this episode in particular are fast-paced, tense and thoroughly enjoyable. The final few moments and the cliff-hanger are unmissable and worth buying the video for alone.