Alpha was one of three altered Daleks given the Human Factor as an experiment by the Dalek Emperor. The others were Beta and Omega. (DW: The Evil of the Daleks) Alpha survived the Dalek Civil War on Skaro and led humanised Daleks to the planet Kyrol. Here they survived and bred, but were manipulated by Kata-Phobus, a telepathic parasite. They destroyed themselves to stop it from feeding on them. (DWM: Children of the Revolution)