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Featuring: William Hartnell, Jacqueline Hill, Maureen O'Brien, William Russell, Peter Craze
Exploring a museum on the planet Xeros, the travellers discover they are invisible. The Doctor deduces that the TARDIS has jumped a time track and can see their own future.
Cliffhanger: having temporarily been frozen in time, the travellers discover their exhibits have vanished, and the Doctor realises that they have caught up with themselves in time ...
Synopsis Source: Doctor Who Guide