UNIT's attempts to locate the meteorites are hampered by the mysterious plastic Autons, being constructed by Channing at a nearby factory, while the Doctor makes another attempt to escape from the hospital.
Quest roles:
Nicholas Courtney(Brig. Lethbridge-Stewart), Hugh Burden(Channing), John Breslin(Captain Munro), Antony Webb(Dr. Henderson), George Lee(Farmworker), Neil Wilson(Sam Seeley), Hamilton Dyce(Major General Scobie), Henry McCarthy(Dr. Beavis), Derek Smee(Ransome), John Woodnutt(Seron), Betty Bowden(Meg Seeley)