This episode was wiped by the BBC and no copy of it is known to exist.
The last purely historical story with no science-fiction content for Doctor Who (1963) until Black Orchid in 1982.
This episode is the first appearance of Jamie McCrimmon, who would go on to become the longest running companion in the entire series and one of the defining features of the Second Doctor's Era.
This episode takes place in Scotland on April 16, 1746.