Rex Harrison and Wendy Hiller also appeared together as a romantic couple forty years earlier in Major Barbara (1941).
The Kingfisher opened on Broadway (New York City) at the Biltmore Theater on December 6, 1978 and ran for one hundred eighty-one performances starring Sir Rex Harrison and Claudette Colbert.
Wendy Hiller appeared in Pygmalion (1938) (based on the play written by George Bernard Shaw) as Eliza Doolittle. Sir Rex Harrison starred in My Fair Lady (1964) (based on George Bernard Shaw's play "Pygmalion") as Professor Henry Higgins.