(He laughs.) CELL
(The DOCTOR has been placed in a darkened cell. CORRIDOR
(The travellers continue their journey back to the entrance way.) Galactic conquests are a thing of the past. I say we go on. Like everything on this planet, including us. MOROK MESSENGER: Not from the planet Morok - alien. On the screen is a still image of IAN, BARBARA and VICKI in one of the corridors of the museum.) There's no time for arguments. These are Xerons and these two are the ones that failed to see the travellers in the room that contained the Dalek exhibit.) They've had time to do that and they haven't. VICKI: The TARDIS! Well, if they came here knowing that, and they must have done, it can only be to see the Moroks. Yes, Xeros is a museum.
Plan: A: the planet Xeros; Q: Where do the Doctor and his companions arrive after the TARDIS jumps a time track? A: the planet; Q: What do the Morok invaders rule? A: exhibits; Q: What are the Doctor and his companions' future selves displayed as in the museum? A: the warlike Morok invaders; Q: Who now rules the planet? A: Vicki; Q: Who helps the native Xerons obtain arms and revolt against the Moroks? A: The revolution; Q: What succeeds and the travellers go on their way, confident that the future has been changed? Summary: he TARDIS jumps a time track and the travellers arrive on the planet Xeros. There they discover their own future selves displayed as exhibits in a museum established as a monument to the galactic conquests of the warlike Morok invaders who now rule the planet. When time shifts back to normal, they realise that they must do everything they can to avert this potential future. Vicki helps the native Xerons obtain arms and revolt against the Moroks. The revolution succeeds and the travellers go on their way, confident that the future has been changed.