Our story begins by focusing on a random group of desert dwellers on the planet of Sarn. There isn't a whole lot to know about these guys, outside the fact that they worship a god named Logar and they have a Chosen One, named Malkon, who is declared so because of a special double-triangle symbol burned into his flesh. A lot of the opening of this episode, and indeed a lot of the serial, generally contains two groups of these people bickering on if their god really exists or not... and it generally goes nowhere, seeing how it's a 'C' plot in a Doctor Who story that's already got a rather busy 'A' and 'B' plot running.