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 Daleks and the Space Security Service. A synopsis of the episode was published in The Official Doctor Who & the Daleks Book.

A notable aspect of the script is that one of the characters is Sara Kingdom, who Nation would later feature in The Daleks' Master Plan (along with other characters and concepts from his aborted spin-off).

Audio Production
Big Finish produced a full cast audio drama of this story for The Second Doctor Boxset, a part of The Lost Stories series, released in December 2010. Terry Nation's original story was adapted by Nicholas Briggs & John Dorney. It stars Jean Marsh as Sara Kingdom, Alan Cox as Mark 7, Chris Porter as Jason, Alex Mallinson as David Kingdom and Nicholas Briggs as the voice of the Daleks.