Ventress is concerned about an old flame when her marriage looks set to end in tragedy.
With her crew slowly vanishing, Briggs assumes the Doctor to be the guilty party.
The Cybermen are released from their silos and are on the march, attacking Briggs's crew and ensuring that the freighter remains on course for Earth. But why?
The Doctor realises the freighter is now a huge bomb and sends it back through time where it can explode millions of years ago... but Adric is still aboard...
