Guest Stars Amanda Hillwood as Doctor Grayling Russell Seeta Indrani as Laboratory Assistant Claire Skinner as Girl Pupil Patricia Hodge as Lady Hanbury Clifford Rose as Dr. Charles Hudson Michael Thomas as John McKendrick Michael Godley as Sir Julius Hanbury Patsy Byrne as Mrs. Maltby Lill Roughley as Betty Parker Michael Bertenshaw as Detective Bernard Lloyd as Professor Edward Ullman Robert Oates as Ted Parker Alan Barker as Plain Clothes Officer John Cater as The Dean Eunice Roberts as Policewoman Trevor Martin as Porter Irina Brook as Michelle Réage John Elmes as Roger Meadows Rainbow Dench as Georgina Hanbury Jonathan Donne as Constable Uncredited Colin Dexter as Man sitting near the Master in the opening scene
