The Destroyers ( unproduced spin - off ) The Destroyers was an unproduced pilot episode planned as a spin - off series for American television . The actual title of the proposed spin - off series is not known . It was written by Terry Nation , and was supposed to feature the Dalek s and the Space Security Service . A synopsis of the episode was published in " The Official Doctor Who & the Daleks Book " in 1988 . A notable aspect of the script is that one of the characters is Sara Kingdom , whom Nation had featured in " The Daleks ' Master Plan " ( along with other characters and concepts used in his aborted spin - off ) . Plot . Carson and Wayne are members of a space exploration team , guarding their base dome surrounded by a force field . Despite this , Daleks penetrate the field and kill Carson . His death alerts Wayne , Morgan and Sara Kingdom . Sara sounds the alarm as the Daleks attack . There are apparently no survivors . The Special Space Security ( SSS ) sends three agents to investigate : Captain Jason Corey , Sara ' s brother David Kingdom and android Mark Seven . They discover Whitman still alive . He cannot identify their attackers , but tells them that they took a few prisoners , before he dies . Sara is in fact alive but wounded , dodging the Daleks in the jungle . The Daleks have Philip Leigh as a prisoner for interrogation . Their instrumentation detects movement at the dome , and they send a patrol to annihilate whatever is alive there . The agents have discovered the Dalek tracks and are following them when the Daleks approach the dome . Jason , Mark and David hide in the bushes , where they are attacked by man - eating plants . Mark makes a noise , and the Daleks blast away at the bushes before proceeding to the dome . Jason and David free themselves with their knives and go to Mark ' s aid . Being a robot , he is mostly undamaged from the attack , and needs only minor repairs before he is functional again . Sara has taken refuge in the cave that is the entrance to the Daleks ' underground base . They activate their defence mechanisms , shadowy spectres that attack her , enveloping her in webbing . The Daleks take her captive . Jason , David and Mark find the cave , just ahead of the Dalek patrol returning from the dome . Their way forward is blocked by a chasm , but knowing there must be some way for the Daleks to cross it , they hide and see two Daleks activate a tubular bridge . As one crosses , they jump the other , and Mark tosses it into the chasm . The first Dalek tries to return but David deactivates the bridge , sending the creature plunging into the abyss . In Dalek central control , Leigh is eliminated now that they have a better prisoner in Sara . The Black Dalek orders the ship prepared for departure . The agents arrive at the perimeter in time to see this , but not in time to stop it . The Dalek ship launches , taking Sara with it . Notes . On 1 November 1966 , midway through recording of " The Power of the Daleks " , Terry Nation approached the BBC about spinning off the Daleks into their own television series . It would spotlight the Space Security Service and Sara Kingdom , both of whom had been created by Nation for " The Daleks ' Master Plan " ( broadcast November 1965 - January 1966 ) . Impressed by Jean Marsh ' s performance in that serial , Nation intended for her to reprise the role in the new series . Nation provided a two - act pilot script , entitled " The Destroyers " , and suggested that the Dalek programme should be made on film and in colour . By 13 November , Nation ' s Lynstead Film Productions seemed to have been given the go - ahead for a pilot episode of a half - hour Dalek series , to begin production on Monday 12 November . On 22 or 25 November , however , the BBC pulled out of the project . In 1967 Nation attempted to sell the series to America ' s NBC network , but without success . Consequently , the BBC opted to take the Daleks out of " Doctor Who " permanently , and so a final showdown was scheduled in " The Evil of the Daleks " , written by David Whitaker and broadcast May to July 1967 . The characters of SSS agents Sara Kingdom and " Agent Seven " had already appeared in " The Dalek Outer Space Book " , published in September 1966 . Terry Nation had mentioned the possibility of a Daleks series as early as 3 August 1965 , in an interview with The Sun newspaper . In 2004 , Loose Cannon Productions made a five minute " reconstruction " of the pilot , along with a brief featurette on the background to it . It " cast " Edward de Souza as Captain Jason Corey , Nicholas Courtney as David Kingdom and William Gaunt as Mark Seven . Audio production . Big Finish produced a full cast audio drama of this story ( " The Destroyers " ) for " The Second Doctor Boxset " , a part of " The Lost Stories " series , released in December 2010 . Terry Nation ' s original story about soldiers in the far future battling the menace of the Daleks was adapted by Nicholas Briggs & John Dorney , and largely switched the roles of Sara and David . It starred Jean Marsh as Sara Kingdom , Alan Cox as Mark Seven , Chris Porter as Jason Corey , Alex Mallinson as David Kingdom and Nicholas Briggs as the voice of the Daleks .