Inferno is the fourth and final serial of the seventh season of the
British science fiction television series Doctor Who, which was first
broadcast in seven weekly parts on BBC1 from 9 May to 20 June 1970.
The serial remains the last time a Doctor Who story was transmitted in
seven episodes. This serial was also the last regular appearance of
Caroline John in the role of Liz Shaw.In the serial, the alien time
traveller the Third Doctor (Jon Pertwee) transports himself "sideways
in time" to a parallel world, where an English drilling project causes
catastrophic amounts of heat and force to be unleashed when it
penetrates the Earth's crust.The Third Doctor and UNIT are called in
to investigate a murder at Project Inferno, an effort to drill through
the Earth's crust to harness great energies within the planet's core.
It transpires that the drilling is producing a green ooze that
transforms all who touch it into savage humanoid creatures called
Primords, who can only be killed via extreme cold. Unbeknownst to
anyone, the project leader, Professor Stahlman has been infected and
is in the early stages of the change. After quarrelling with Stahlman,
the Doctor attempts an experiment on the detached TARDIS console, but
a freak accident transports him into a parallel space-time
continuum.In this new universe, where Great Britain is a fascist
dictatorship, the Doctor is captured and interrogated by Brigadier
Lethbridge-Stewart's counterpart, a sadistic military commandant known
as the Brigade Leader, along with the counterpart of the Doctor's
companion Liz, who in this universe became a military officer instead
of a scientist. When the drill penetrates the Earth's crust it
unleashes immense amounts of heat and poisonous gases, along with more
of the ooze, which Stahlman's counterpart uses to transform most of
the remaining project staff into more Primords. The Doctor determines
that the unleashed energies of the core will eventually disintegrate
the planet, and is able to persuade the surviving staff members to
help him return to his own dimension and prevent a similar
catastrophe. They eventually succeed in restoring power to the TARDIS
console despite repeated Primord attacks, but Liz's counterpart is
forced to kill the Brigade Leader when he turns on the Doctor, who
narrowly escapes as the Project Inferno facility is destroyed by a
massive volcanic eruption. Inferno (Doctor Who) Biography, NetWorth, Height, Age, Weight, Family, Married, Son, Daughter