Their interest in the problems of science changing and endangering human life had led them to create the popular alien race the Cybermen for that programme, and it was similar interests that led them to create Doomwatch, which explored all kinds of new and unusual threats to the human race, many bred out of the fear of real scientific concepts, with a "this could happen to us" fear by the public.
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Although the main characters from the series did all appear, played by their original actors, main billing went to Ian Bannen and Judy Geeson as new characters.
Furst was regularly featured in UK television drama series of the 1960s and early 1970s with appearances in The Saint, The Champions, Doomwatch, The Persuaders!, and as the mad (and well remembered) Professor Zaroff in the Doctor Who story The Underwater Menace.
He also directed episodes for numerous BBC series/serials on the 1960s and 70s, including The First Lady, The Troubleshooters, Doomwatch, Warship, The Brothers, Softly, Softly: Taskforce and The Onedin Line.