William Russell was unhappy with six minutes of new scenes which had been added to this episode the day before its recording. As a result of this complaint, the regulars were given greater script approval in future.
The master videotape was wiped by the BBC in 1967. No footage is known to survive.
Telesnaps and extracts from the original soundtrack, are included as part of a 30-minute abridged reconstruction of the story "Marco Polo". This is included as part of "Doctor Who: The Beginning" DVD collection released in January 2006.
This episode takes place in China in 1289.
This episode was watched by 9.9 million viewers on its original transmission.