with Gray in There Was a Young Lady (1954), and supported Richard Greene in Contraband Spain (1955). Denison began appearing regularly on television. He was a panellist in the 1953 series of the BBC's What's My Line? and from 1956 to 1964 he starred in the title role of the ITV series Boyd QC, which ran for 78 episodes. He played what one critic called a "suave and elegant barrister ... Britain's answer to Perry Mason" (although the Boyd series came first). The first 40 episodes were transmitted live. At the Prince's Theatre in February 1954 Denison appeared as the White Knight, Tweedledee and Humpty Dumpty in Alice Through the Looking Glass; Gray played the White Queen. They reprised these roles the following year. At the Westminster in June 1954 Denison played Francis Oberon in We Must Kill Toni. He toured South Africa with Gray from December 1954 to February 1955, in The Fourposter and Private Lives. He joined the Shakespeare Memorial Theatre Company, Stratford-on-Avon in April 1955. The company that season included Laurence Olivier, Vivien Leigh and Anthony Quayle, and Gielgud and Peter Brook were among the directors; Denison appeared as Sir Andrew Aguecheek in Twelfth Night, Bertram in All's Well That Ends Well, Dr Caius in The Merry Wives of Windsor, and Lucius in Titus Andronicus. In November 1955 Denison turned to directing. Gray had written a play, Love Affair, which opened under her husband's direction at the Alexandra Theatre, Birmingham and transferred to the Lyric Theatre, Hammersmith in June 1956, with author and director in leading roles. In 1956 Denison appeared at the Edinburgh Festival and later at the Berlin Festival in two Shaw plays: A Village Wooing (as "A") and Fanny's First Play (as Lieut. Duvallet). He appeared in a supporting role in the 1957 film The Truth About Women. At the Aldwych Theatre in August 1957 Denison played Charles Cuttinghame in Meet Me By Moonlight, an only moderately successful mock-Victorian musical. In 1958 he toured with Gray in a two-hander thriller, Double Cross, but his schedule for Boyd QC prevented him from appearing in the piece when it opened in the West End, and his role was taken by Terence Morgan. Denison's last stage role of the 1950s was the Duke of Hampshire, with Gray as the Duchess, in a revival of Frederick Lonsdale's Let Them Eat Cake at the Cambridge Theatre in May, 1959.