The Doctor, Romana and Rohm-Dutt are sentenced to death by the Swampies while the refinery crew try to work out a way to destroy Kroll.

In their search for the final segment of the 'Key To Time', the Doctor and Romana land the TARDIS on the world of Atrios who is at war with it's neighboring planet Zeos. Upon avoiding a missile attack right before landing, the Doctor and Time Lady Romana are then mistaken for spys from Zeos by the Marshall.