It's up there with Dennis Potter. By a man called Robert Holmes. When the history of television drama comes to be written, Robert Holmes won't be remembered at all because he only wrote genre stuff. And that, I reckon, is a real tragedy." Although the script and the general production of the serial has been highly praised, some commentators have criticised elements of it such as the realisation of the giant rat and the depiction of the Chinese characters. Patrick Mulkern, in his Radio Times review, acknowledged the "wretched realisation of the giant rat". In his volume of British history State of Emergency, Dominic Sandbrook criticizes the giant rat for being "one of the worst-realized monsters not merely in the show's history, but in the history of human entertainment." Howe and Walker noted that its flaw was the realisation of the giant rat, though the story "still contains its fair share of gruesome and disturbing material". Future Doctor Who executive producer Steven Moffat said in 1995: "How could a good hack think that the BBC could make a giant rat? If he'd come to my house when I was 14 and said 'Can BBC Special Effects do a giant rat?' I'd have said no. I'd rather see them do something limited than something crap. What I resented was having to go to school two days later, and my friends knew I watched this show. They'd go 'Did you see the giant rat?!' and I'd have to say I thought there was dramatic integrity elsewhere." The depiction of Chinese characters and culture, and use of yellowface in the serial, has been criticised as racist. Some of the English characters display racist attitudes towards the Chinese characters, which go unchallenged by the Doctor, who normally stands up for marginalized groups. Meanwhile, the Chinese immigrants themselves are portrayed in a stereotypical fashion – other than Li H'sen Chang (a major villain who is himself akin to Fu Manchu, but portrayed by a white actor – another source of criticism), all of the Chinese characters are coolies or members of Tong gangs. The Chinese Canadian National Council for Equality characterized the content of the episodes as "dangerous, offensive, racist stereotyping [which] associate the Chinese with everything fearful and despicable". As a result of their complaint to TVOntario, the Canadian channel chose not to broadcast all six episodes of the serial. Christopher Bahn wrote, "If