 Sets used for this film/double episode were later reused for  _"Prisoner, The" (1967)_ (qv). Many actors from the series appear in  this film. This film edits together the first two episodes of what  was to have been the third season of _"Danger Man" (1964)_ (qv).  After filming these episodes, Patrick McGoohan (qv) quit the  series in order to create _"Prisoner, The" (1967)_ (qv) The  character of Potter, played by Christopher Benjamin (qv),  reappears in an episode of _"Prisoner, The" (1967)_ (qv), which is  considered evidence that the lead character of that series (referred  to only as No. 6) was in fact John Drake.