- Unknown:
- J. B. Priestley
- Adapted By:
- Mollie Greenhalgh
- Production By:
- Martyn C. Webster
- Professor Robert Linden:
- Edward Chapman
- Isabel, his wife:
- Gladys Young
- Rex Linden, his son:
- Barry Morse
- Dr Jean Linden, his eldest daughter:
- Catherine Campbell
- Marion de Saint Vaury, his second daughter:
- Isabel Dean
- Dinah Linden, his youngest daughter:
- Beryl Calder
- Alfred Lockhart,University secretary:
- James Thomason
- Edith Westmore, a student:
- Ann Totten
- Bernard Fawcett, a student:
- Frank Partington
- Mrs Cotton, housekeeper:
- Sophie Ellis