Travels of Marco Polo
Plot: Explorer Marco Polo is assigned to accompany two priests on a mission to China, to try to convert the "pagan" Kublai Khan to Christianity. However, on a dangerous trek through the mountains, the priests decide they don't believe that China even exists, and when Marco tries to argue the point, they abandon him and turn back

Alistair Duncan
Tim Elliott
Ron Haddrick
Helen Morse