Deffry Vale High School was a high school in London, England. It was infiltrated by the Krillitanes, who fed the children who attended the school with chips cooked in Krillitane oil, which gave the children's intelligence a significant boost. The Krillitanes hoped to use the super-intelligent children to crack the Skasis Paradigm, which would give the Krillitanes control over the very fabric of reality. Mysterious lights in the sky, as well as a spate of mysterious illnesses and incredibly high results brought the school to the attention of Sarah Jane Smith and Mickey Smith separately. The Tenth Doctor and Rose Tyler went undercover in the school during the final stages of the Krillitane's plans, thanks to Mickey. Rose masqueraded as a dinner lady while the Doctor replaced the previous phy