- Writer:
- Evelyn Frazer
- Designer:
- Susan Spence
- Producer:
- George R. Foa
- Mason:
- Neil Wilson
- Dr Helen Schroder:
- Kay Hawtrey
- Dr Andrew Mortimer:
- Mervyn Johns
- Dr Philip Gage:
- Owen Holder
- Sir Keith Vernon:
- Cyril Luckham
- Professor Hubbard:
- Laidman Browns
- Margot Gage:
- Lana Morris
- Miss Arniltage:
- Rosamund Greenwood
- First Policeman:
- David Rendall
- Second Policeman:
- Bryan Bada
- Detective-Sergeant Green:
- Clifford Earl
- Detective-Inspector Snaith:
- Edward Harvey
- Dr MacPherson:
- Jack Lambert
