sentences:  In the story, the Doctor is subpoenaed to appear in court when a corporation tries to buy Earth in order to obtain a matter-transmutation device.Big Finish Productions has announced an audio adaptation of this story, written by Nev Fountain for their Lost Stories range, due to be released in November 2021.Written by Pennant Roberts, this four-part story was commissioned on 10 January 1979 as "Dragons of Fear".