interviews were published in the 1980s. The show itself bears no "created by" credit. Some sources indicate McGoohan was the sole or primary creator of the show. McGoohan stated in a 1977 interview broadcast as part of a Canadian documentary about The Prisoner called The Prisoner Puzzle that, during the filming of the third series of Danger Man, he told Lew Grade, managing director of ITC Entertainment, that he wanted to quit working on Danger Man after the filming of the proposed fourth series. Grade was unhappy with the decision, but when McGoohan insisted upon quitting, Grade asked if McGoohan had any other possible projects; McGoohan later pitched The Prisoner. In a 1988 article from British Telefantasy magazine Time Screen, though, McGoohan indicated that he had planned to pitch The Prisoner before speaking with Grade. In both accounts, McGoohan pitched the idea orally, rather than having Grade read the proposal in detail, and the two made an oral agreement for the show to be produced by Everyman Films, the production company formed by McGoohan and David Tomblin. In the 1977 account, McGoohan said that Grade approved of the show despite not understanding it; whereas, in the 1988 account, Grade expressed clear support for the concept. Other sources, however, credit Markstein, then a script editor for Danger Man, with a significant or even primary portion of the development of the show. For example, Dave Rogers, in the book The Prisoner and Danger Man, said that Markstein claimed to have created the concept first and McGoohan later attempted to take credit for it, although Rogers himself doubted that McGoohan would have wanted or needed to do that. A four-page document, generally agreed to have been written by Markstein, setting out an overview of the themes of the series, was published as part of an ITC/ATV press book in 1967. It has usually been accepted that this text originated earlier as a guide for the series writers. Further doubt has been cast on Markstein's version of events by author Rupert Booth in his biography of McGoohan, entitled Not a Number. Booth points out that McGoohan had outlined the themes of The Prisoner in a 1965 interview, long before Markstein's tenure as script editor on the brief fourth series of Danger Man. At any rate, part of Markstein's inspiration came from his research into the Second World War, where he found that some people