BBC1 airs the fifth episode of the science fiction series Doomwatch, created by former Doctor Who writers Kit Pedler and Gerry Davis. Davis writes this episode, but in a very rare occurrence, goes uncredited on screen.
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Also of interest...
Doctor Who: The Mutants, Part 6
May 13, 1972
The X-Files: End Game
February 17, 1995
The X-Files: Salvage
January 14, 2001