2/7 The caravan journeys across the dry Gobi desert. Tegana secretly slashes the water gourds.
BBC Television Service
1/7 The TARDIS lands in the Himalayas and the Doctor, Barbara, Ian and Susan meet Marco Polo.
2/2 As the TARDIS's power threatens to escape and destroy the Ship, the crew fight each other.
1/2 The TARDIS is suspended in space and the Doctor is confused by his Ship's readings.
7/7 The Thals and the TARDIS crew attack the Daleks from all sides, but the Daleks fight back.