Sonia Dresdel. Sonia Dresdel was 41 in The Third Visitor as 'Steffy Millington'.Guy Middleton. Guy Middleton was 44 in The Third Visitor as 'Inspector Mallory'.Hubert Gregg. Hubert Gregg was 36 in The Third Visitor as 'Jack Kurton'.Colin Gordon. Colin Gordon was 39 in The Third Visitor as 'Bill Millington'.Karl Stepanek. Karl Stepanek was 51 in The Third Visitor as 'Richard Carling'.Eleanor Summerfield. Eleanor Summerfield was 29 in The Third Visitor as 'Vera Kurton'.John Slater. John Slater was 34 in The Third Visitor as 'James C. Oliver'.Michael Martin Harvey. Michael Martin Harvey was 53 in The Third Visitor as 'Hewson (as Michael Martin-Harvey)'.Cyril Smith. Cyril Smith was 58 in The Third Visitor as 'Detective Horton'.Maurice Elvey. Maurice Elvey was 63 in The Third Visitor as 'Director'Stephen Dade. Stephen Dade was 41 in The Third Visitor as 'Director of Photography'David Evans. David Evans was 57 in The Third Visitor as 'Writer'Gerald Anstruther. Gerald Anstruther was >> in The Third Visitor as 'Screenplay, Theatre Play'Ernest Gartside. Ernest Gartside was >> in The Third Visitor as 'Producer'Helen Wiggins. Helen Wiggins was >> in The Third Visitor as 'Editor'Aldo Manganaro. Aldo Manganaro was >> in The Third Visitor as 'Makeup Artist'George Haslam. George Haslam was >> in The Third Visitor as 'Art Direction'Betty Sherriff. Betty Sherriff was 25 in The Third Visitor as 'Hairstylist'