Callufrax Minor was one of the planets taken by the New Dalek Empire in 2009 and transported to the Medusa Cascade, where it joined twenty-six other planets. (TV: The Stolen Earth) It was returned after Donna Noble defeated the Daleks and Davros. (TV: Journey's End)
According to a computer readout at the Shadow Proclamation, the planet was uninhabited by 2009. The readout also said that its "size" was 62,137 kelix, its mass was 100,297.5 gaats, and its atmosphere was 27% olb. (TV: The Stolen Earth) However, according to another account, a parasitic race called the Tactire lived there. (COMIC: The Forgotten)
Behind the scenes
Callufrax Minor was seemingly named as a reference to Calufrax, the last planet crushed by the space pirates of Zanak, and which was, in fact, a disguised segment of the Key to Time. (TV: The Pirate Planet)