The Stolen Earth
Aside from his "Armstrong and Miller" sketch show characters, Armstrong's television credits include a leading role in the TV series "Life Begins", whilst he also voiced Professor M in "Tooned", alien supercomputer Mr Smith in the "Doctor Who" spin-off "The Sarah Jane Adventures" as well as the main show's two part story "The Stolen Earth" / "Journey's End", and the title character in the revived series of "Danger Mouse".