The TARDIS lands in a petrified forest on an alien planet. Determined to explore, the Doctor leads his companions into the metal city, where they discover the danger of what will become his deadliest enemies, the mutant Daleks. (Originally broadcast in seven parts.) Written by
Did You Know?
16mm telerecordings of this serial were saved by Ian Levine
, who discovered them at BBC Enterprises marked for destruction in 1978. See more
Early in the episode, the studio backcloth moves from the effect of a wind machine. See more
The only interest we have in the Thals is their total extermination!
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