People encountered by the investigators during their activities in Western Australia.
Binjudu - A man from Power Boy's tribe who speaks some English.
Dingo Man - Strange man encountered by Chuck just outside a deserted mining camp, accompanied by a number of dingos, and wearing nothing but a pair of brown shoes. He didn't seem very friendly, so Chuck left him to it.
Jones, Laura (Mrs) - Widowed owner of the guest house in Cuncudgerie where the investigators stayed.
Kakakatak - Member of the Great Race, encountered by the investigators in the Lost City, where he had been imprisoned by Dr Huston. Last seen heading of into the depths of the city, accompanied by Helena.
Mackenzie, Robert B F - Resident of Port Hedland and executor of the MacWhirr estate.
Power Boy - A strange Aboriginal Boy of about 10 years, who appears to command mystical powers. He showed the investigators an alternative route into the Lost City, but did not accompany them. After their adventure in the city, the investigators met him again at the strange new lake.
Randolph, Toddy - Owner of the Randolph Shipping Company in Darwin, Australia. Recipient of goods from Edward Gavigan and Robert Huston.
Walton, Jack - Hired as Lead driver on the investigators expedition into the Great Sandy Desert. Accompanied by his aboriginal assistants, Sammy and Benny. Last seen escaping from Huston's HQ.
Westwood, Nevill - Seventh Day Adventist attempting to circumnavigate Australia by automobile, accompanied by his associate Greg Davies. Encountered by the investigators in Cuncudgerie.
Whitlock, Fred - Drover taking his mob of 600 cattle down the Canning Stock Route, accompanied by his aboriginal team: Bull, George, Big Henry and Little Henry. The investigators travelled with them from Power Boy's lake down to Wiluna.
Wycroft, Mortimer - Cuncudgerie-based outfitter, who appears to have some connection with Toddy Randolph and/or Robert Huston and the Sand Bat cult. Now deceased.