The Second Doctor > Jamie McCrimmon > Victoria Waterfield > Robot Yeti > Yeti > Great Intelligence
Turns out the Great Intelligence is the Yeti of this story.
The First Doctor > Barbara Wright > Ian Chesterton > Susan Foreman > Yeti > Mongols > Kublai Khan > Marco Polo
The Doctor & Co go on a road trip to Peking with Marco Polo. Meanwhile, a man by the name of Tegana is plotting to steal the TARDIS.