Baran was a sergeant in the Thal military and, in effect, the first Dalek.
He was assigned to infiltrate Kaled military headquarters and uncover their secret plans. He encountered Davros while posing as a Muto in the Wastelands shortly before he was captured by a Thal squad. He later infiltrated the Kaled Dome and posed as a Kaled corporal. He discovered Davros' genetic experiments but was captured by Nyder.
Davros, recognising him as a Thal spy, made Baran the subject of his next operation, the first to be performed on a Thal. After irradiating and augmenting the brain, Davros had it transplanted into a Mark I travel machine, thus creating the first prototype Dalek. (AUDIO: Guilt)
Behind the scenes[]
Baran in his Mark I Travel Machine (DOC: Davros Connections)
Nicholas Briggs, who played the part of Baran, currently serves as the voice of the Daleks.