revolution. Leela and the Doctor head for the Collector's Palace, where the Doctor sabotages the computer system. The Collector arrives and is challenged by the Doctor, who discovers that he is a Usurian, a seaweed-like sentient poisonous fungus, from the planet Usurius. The Doctor denounces his operation on Pluto, which had consumed Mars as well after the Earth had become non-viable. Before the Collector can implement a plan to exterminate the population of Pluto with poison gas, Cordo and the lead rebels help the Doctor defeat the remaining members of the Inner Retinue. The Collector checks his computer to find the Doctor's input has resulted in projected bankruptcy, and the shock causes the Collector to revert to his natural state in a compartment at the base of his wheelchair. The Doctor seals him in, and he and Leela depart with K9, leaving Cordo, Mandrel and the others to contemplate recolonising the Earth. Production Cast notes Michael Keating also appeared in the audio play The Twilight Kingdom as Major Koth and in Year of the Pig as Inspector Chardalot. Louise Jameson stated in the DVD commentary of the story and on the commentary for The Talons of Weng-Chiang that The Sun Makers was her favourite serial. Outside references Robert Holmes intended the serial to be a satire of his own experiences with the Inland Revenue services. However, much of the political content was toned down by order of producer Graham Williams, who feared it would be controversial among viewers. Many of the letters and numbers used to denote the labyrinth of corridors in the city, for example P45, allude to well-known tax and Governmental forms, and the abbreviation used to refer to the suppressant gas 'PCM' also stands for Per Calendar Month. The actor who played the Collector, Henry Woolf, had deep bushy eyebrows, very reminiscent of the then-Chancellor of the Exchequer, Denis Healey. However, Holmes presented the villains of the piece as working for a private corporation rather than a government. The director had originally intended that the giant credit cards featured in the story should resemble Barclaycards. This was vetoed by producer Graham Williams who said that it would be free publicity for the bank. Near the end of Part Two, when prompted by Mandrel for a story, the Doctor begins, "Once upon a time, there were three sisters..." mirroring the same story he started telling Sarah Jane Smith