Fire and Brimstone ( comic story ) Fire and Brimstone was a " Doctor Who Magazine " comic story featuring the Eighth Doctor . Summary . The Doctor and Izzy materialise on Icarus Falling , a small satellite orbiting Crivello ' s sun , and witnessed an attack on it by Dalek s . While attempting to stop the Daleks ' plans , it is revealed that another of the Doctor ' s deadliest enemies , the megacorp known as the Threshold , was hired to destroy the Daleks , and already had a plan in motion . This plan fails , and Izzy escapes with the Threshold ' s payment and a portal - generating Threshold ring . She warps to the Doctor ' s location , who has been informed of the Threshold ' s mission , and knows who hired them : After all , the box containing their payment was embossed with the Seal of Rassilon . The Doctor manages to defeat both the Daleks and the Threshold by making Crivello ' s sun go nova . However , as the Doctor and Izzy escape in the TARDIS , a Threshold agent appears to remind the Doctor of his hollow victory and their continuing machinations . Plot . PART ONE : FIRE AND BRIMSTONE On board the satelloid Icarus Falling , the communications seer , Ptolemy Muttonchops , looks into the gazing pool at the augury , where he is terrified by visions of fire and brimstone . Unsure of what to do , he visits Sister Chastity , his superior , and tells her all he has seen . However , she soothes his fears and does not report his findings to anyone . Meanwhile , the Tardis has landed in another part of Icarus Falling . The Doctor is unsure of where they are and why they have landed somewhere , citing trouble in the vortex as a reason for their early appearance . However , before he can theorise further , he and Izzy are captured by guards and taken to see the leaderene , who asks them to justify their presence . The Doctor has discovered their location : one of the six satellites orbiting Crivello ' s Cauldron . He wonders aloud how he could have landed in the same place 200 years after his previous landing ( in the Keep ) . However , before they can talk further , a technician spots approaching alien spacecraft , who breach the hull of Icarus Falling . Soldiers arrive to shoot the spacecraft , but are exterminated by the creatures inside . . . the Daleks . PART TWO : RELEASE THE CONTAGIUM ! The Doctor introuduces the Daleks that have entered the satellite to the leaderene and Izzy . The leaderene states that all of Icarus Falling is reinforced by metres of metal and kevlar , but the Doctor is unable to reassure him , stating that the Daleks will only take 20 Minutes or so to breach it . Suddenly , Ptolemy Muttonchops enters and announces that they are all doomed . He recognises the Doctor as part of the vision he had at the beginning of the story , and hurriedly leads him away to view the vision for himself . Izzy is left with Sister Chastily and the leaderene , who the Doctor says will protect her . In the bottom half of Icarus Falling , the Daleks state they must act quickly , and release the Contagium , which is an insect - like creature with Dalek roundels covering its body . The Doctor and Ptolemy are at the augury , where the Doctor wonders what makes Ptolemy so special , given that the last person to attempt to commune with the Cauldron aged sixty years in sixty seconds . Suddenly , the Doctor and Ptolemy see the Contagion in the gazing - pool and decide to return to the main control room , where the Contagion as arrived . The Contagion bursts up through the floor of the control room and impales the leaderene , killing her . Her eyes turn an al colour , and she suddenly begins spewing out nanites in every direction , which several people inhale , killing and possessing them as well . Izzy and Sister Chastity flee , while the now - possessed leaderene opens the doors to the Daleks . Izzy and Sister Chastity meet up with the Doctor and Ptolemy , where the Doctor reveals the Contagion as a weapon which attached itself to a Host and then uses it to churn out nanites who burrow their way into people ' s brains and take control of them . The Doctor decides to speak to the Daleks . Entering the room where they are located , he asks if they know what brought his Tardis here . The Daleks state that he is an enemy , and promptly exterminate him .