With the newly-regenerated Doctor (Tom Baker) behaving erratically, Brigadier Lethbridge-Stewart and UNIT have to contend with the theft of the plans for the new disintegrator gun by what seems to be a mechanical monster. However, the theft is only the beginning of a plot to hold the world to nuclear ransom.
UNIT are called in when top secret plans and valuable equipment is stolen from high security establishments.
Using the deadly disintegrator weapon, the robot steals the destructor codes.
Sealed inside an underground bunker, Miss Winters issues her demands to the world's leaders.
The robot, distraught over killing its creator, takes Sarah hostage and goes on a rampage.
Fourth DoctorTom Baker
Sarah Jane SmithElisabeth Sladen
Harry SullivanIan Marter
Alistair Gordon Lethbridge-StewartNicholas Courtney
John BentonJohn Levene
ShortTimothy Craven
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