 In "Journey's End", Caan convinced the Meta-Crisis Doctor to destroy the Daleks and end their reign of terror, having himself facilitated the events that led to the creation of the Meta-Crisis Doctor and the DoctorDonna.Caan, the last of the quartet, was consequently killed.Aside from their voices and Sec's unique colouring scheme, each Dalek in the cult has a specific marking on their casing to set them apart from the others.