Following the Dalek-Movellan War, the Gamma Dalek was a grey Dalek subordinate to the Supreme Dalek.
During the Duplicate Incident, Gamma was among the Daleks who Davros conditioned to serve him as opposed to the Supreme Dalek. Ultimately, Davros's Daleks faced the Supreme's Daleks led by the Alpha Dalek in a London warehouse in 1984. Gamma insisted that "Davros must be honoured", after which Alpha opened fire and exterminated Gamma, who managed to land a hit and exterminate Alpha as well. (PROSE: Resurrection of the Daleks)
