Special Guest Stars Edward Mulhare as Professor Mathers Guest Stars David McCallum as Gwyllim Griffiths Jill Haworth as Cathy Evans Nora Marlowe as Mrs. Ives Robert Doyle as Wilt Morgan Constance Cavendish as Gert "the Bread" Evans George Pelling as Policeman Uncredited Janos Prohaska as Darwin the Monkey
