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In the third episode of the seven-part story arc "Marco Polo," the treacherous Tegana (Derren Nesbitt) intends to leave Marco Polo (Mark Eden), the Doctor (William Hartnell), and their traveling companions to die of thirst in the desert. Seeking shelter not only from the elements but also from the bandit hordes which seem to surround them, the travelers are led to the Cave of the Five Hundred Eyes by Lady Ping-Cho (Zienia Merton). The Doctor is at first grateful, but slowly changes his mind when it appears that the grim interior of the Cave may be just as dangerous as what lies outside. Written by John Lucarotti, "The Singing Sands" first aired on March 7, 1964; alas, none of the episodes in the "Marco Polo" arc are known to have survived.