Frontier in Space is the third serial of the tenth season of the British science fiction television series Doctor Who. The serial was first broadcast in six weekly parts on BBC1 from 24 February to 31 March 1973. It was the last serial to feature Roger Delgado in the role of the Master. The serial is set on the Earth, the Moon, Draconia, and the home planet of the Ogrons in the 26th century. In the serial, the Daleks employ the Master to provoke a war between the humans and the Draconians' galactic empires.