Although "genuinely disturbing", this episode is, all in all, a "stone-cold classic piece of British TV sci-fi", said Robinson, and one that is sure to win over "even people who hate 'Doctor Who'".

Harry Potter and the Sorcerer’s Stone and Doctor Who alum Simon Fisher-Becker died on Sunday (March 9). He was 63. His agent Kim Barry confirmed his death in a statement shared with DECIDER.