The one where Caven gets his comeuppance...
Madeleine's continued attempt to get Dervish to turn on his boss and help her get her father back falls on deaf ears. Dervish's allegiance is very strongly to Caven, despite his conscience, and it would be great to see the scenes between Lisa Daniely and Brian Peck because they're performed so well.
Most of this final episode concerns the Doctor's attempts to rescue the LIZ-79 from Caven's booby-trap (which he does) and then his race against time to defuse Caven's remote-controlled explosive device in Ta's atomic fuel store. The trouble is, the scene where the Doctor, in protective suit, tries to do this is so interminably long and drawn out that, as we're unable to see it, the pace is slowed right down to a crawl.