A young married physician discovers a mermaid, and gives into her request to be taken to see London. Comedy and romantic entanglements ensue.
Glynis Johns
as Miranda Trewella
Googie Withers
as Clare Martin
Griffith Jones
as Dr. Paul Martin
John McCallum
as Nigel
Margaret Rutherford
as Nurse Carey
David Tomlinson
as Charles
Yvonne Owen
as Betty
Sonia Holm
as Isobel
Brian Oulton
as Manell
Zena Marshall
as Secretary
Lyn Evans
as Inn Landlord
Stringer Davis
as Museum Attendant
