When revue became less popular in the mid-1950s, Adrian went to America in 1956 to appear as Dr. Pangloss and Martin in Leonard Bernstein's operetta "Candide" on Broadway. The original production was a failure, but the original cast recording has rarely been out of the catalogues in the subsequent half century. He remained in the U.S., working in summer stock in roles as varied as Doolittle in "Pygmalion", Jourdain in "Le Bourgeois Gentilhomme", Shylock in "The Merchant of Venice", and Sir Peter Teazle in "The School for Scandal". He returned to London in 1959 to appear in Noël Coward's play "Look After Lulu!" in which he also later played on Broadway.