Gerald Cross
From Tardis Wiki, the free Doctor Who reference
Gerald Cross (20 February 1912-26 February 1981[1]) voiced one of the Megara in the Doctor Who television story The Stones of Blood.
He also provided the voice of the White Guardian in part one of the same story, for which he was uncredited on-screen, though he was billed as "Voice of the Guardian" in Radio Times. (DWMS Winter 1994)
He had earlier been considered to play Dr Fendelman in Image of the Fendahl. (INFO: Image of the Fendahl)