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In the fifth episode of the seven-part story arc "Marco Polo," the lives of the Doctor (William Hartnell), Marco Polo (Mark Eden), and their combined companions are imperiled not only by bandits, but also by a traitor in their midst, the warlord Tegana (Derren Nesbitt). Still, the entourage manages to enjoy a (pitifully brief) bit of rest and relaxation at the way-station managed by the philosophical Wang-Lo (Gabor Baraker). Under cover of darkness, the Doctor and his friends manage to elude Polo and prepare to board the TARDIS for a journey homeward -- but Susan (Carole Ann Ford) is seized by a shadowy assailant. Written by John Lucarotti, "Rider From Shang-Tu" first aired on March 21, 1964; alas, none of the episodes in the "Marco Polo" arc are known to have survived.