Coldfire Construction, under control by the Slitheen, had built their final transducer in the guise of a technology block inside Park Vale Comprehensive School over summer 2008. The transducers were to be used absorb all the energy out of the Sun, destroying the Earth and thus avenging the deaths of the Passameer-Day Slitheen, while the Slitheen lay safe inside a hidden room in the technology blocks across Earth. They would then use the profits from Earth's remains to buy battlecruisers to destroy Raxacoricofallapatorius' Grand Council.
In September, he killed one Park Vale's teachers, Tim Jeffery, and used his skin as a disguise. With his brother Glune Fex Fize, he began the trial run for the ring of transducers, but it failed. At a science club, Kist tricked the star pupil Luke Smith into coming up with an equation to avoid the overload. The plan started again.
When Maria Jackson killed Glune Fex Fize, he called the rest of the family on Earth to come to Park Vale to capture Luke, Maria, Clyde Langer and Sarah Jane Smith. Luke's equations were wrong, as he didn't know that the Slitheen would draw energy from the Sun, and the capacitor began to overload. The system was reset. Luke started to repair it, but Sarah Jane threw him her sonic lipstick. Luke damaged the machine with the lipstick. While most of the Slitheen and Luke's allies escaped, Kist was electrocuted to death in this incident whilst his son Korst was able to teleport away to safety. (TV: Revenge of the Slitheen)
Having escaped, Korst Gogg Thek Lutiven-Day Slitheen sought revenge against Luke for the death of his father. Joining with fellow Slitheen Dax Fex Fize and Bloorm Vungah Bart, Korst conspired with the Xylok Mr Smith to kidnap Luke and drain him of his nascent telekinetic energy, intending to make a profit at the cost of Luke's life. The Slitheen were, however, forced to assist Sarah Jane in defeating the Xylok when he threatened to destroy the Earth while they were still there. The Slitheen ultimately left Earth once the threat was neutralised. (TV: The Lost Boy)