 Closing, Walker congratulated director Graeme Harper for demonstrating "his incredible versatility" in directing the vastly different "The Unicorn and the Wasp" and "Turn Left", and wrote that any concerns about the plot were "overshadowed" by the script's "inventiveness, intelligence, and sheer boldness". He finished by calling the episode "one of the most extraordinary in Doctor Who's long history". Walker ranked the story as his fifth-favourite episode of the fourth series: between "Silence in the Library" and "Midnight".
