Guest Stars Peter Forbes-Robertson as Time Lord John Scott Martin as Robot Tony Caunter as Morgan John Tordoff as Alec Leeson Stanley McGeagh as Allen Graham Leaman as Time Lord Morris Perry as Dent John Ringham as Ashe Helen Worth as Mary Ashe Mitzi Webster as Mrs. Martin John Line as Martin Sheila Grant as Jane Leeson John Herrington as Holden Norman Atkyns voices Guardian Pat Gorman as Primitive and Voice Pat Gorman as Long Pat Gorman as Colonist Ron Haymann as Alien Priest John Baker as Time Lord Roy Skelton as Norton David Webb as Leeson Bernard Kay as Caldwell Nicholas Pennell as Winton
