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In the sixth episode of the seven-part story arc "Marco Polo," the Doctor (William Hartnell) and his friends, still the reluctant traveling companions of Marco Polo (Mark Eden), arrive at Shang-Tu, where stands the opulent summer palace of the all-powerful Kublai Khan (Martin Miller). Fascinated by the TARDIS, Khan orders the Doctor and the others to accompany him to Peking, and for a while it looks as though none of the people will ever be able to return to their own home and time. Meanwhile, the treacherous Tagana (Derren Nesbitt) continues plotting to become absolute ruler of Cathay. Written by John Lucarotti, "Mighty Kublai Khan" first aired on March 28, 1964; alas, none of the episodes in the "Marco Polo" arc are known to have survived.