The Doctor and Jo are being held prisoner by Axos while Chinn is forced to organise the worldwide distribution of axonite and the Master returns to the power complex to try and steal the TARDIS.
Quest roles:
Richard Franklin(Mike Yates), Nicholas Courtney(Brig. Lethbridge-Stewart), Bernard Holley(Peter Haydon), John Levene(Sergeant Benton), Roger Delgado(The Master), Paul Grist(Filer), Donald Hewlett(Hardiman), Tim Pigott-Smith(Marco), Kenneth Benda(The Minister), Peter Bathurst(Chinn)