The 6th Doctor and Mel travel to Kalsos for the opening of the Great Tower to Kalsos, but arrive as it is being demolished.
Meanwhile the Earth Alliance has just finished a war with the Eminence. On the planet Ridius the people are starving due to the war. The old scientist Helgert Teveler is trying to make the seeds germinate, but is unable too.
- Continuity Nod: While going through a chest the Doctor asks why he needed so many jelly babies.
- The Doctor criticises the work of Professor Laskey.
- The End... Or Is It?: The story ends with the Eminence declaring they will find the Doctor and wipe out humanity.
- Halfway Plot Switch: The first episode of this story has the Doctor and Mel in the Great Tower of Kalsos, but finding out it is being demolished and trying to escape. Their plot then switches to dealing with food shortages in the colonies.
- Heroic Sacrifice: Kenneth.
- "I Know You're in There Somewhere" Fight: This is tried by Kenneth on Barlow Teveler, slowing him down enough for Kenneth to activate self-destruct.
- Pretend to Be Brainwashed: 6 pretends to be under Eminence control.
- Pyrrhic Victory: The war with the Eminence is portrayed as this. The war has left many planets starving, and the society of Ridius is about to collapse.
- Sleeper Starship: Used for a trip from Ridius to Earth that will take two months.
- Taking You with Me: Kenneth sets the Seed centre to self-destruct, destroying the Eminence-infected Barlow.
- Trademark Favorite Food: Kenneth really likes his tea.
- The Virus: The Eminence.
