 In 1937, Cotten became an inaugural member of Welles's Mercury Theatre company, starring in its Broadway productions "Caesar" as Publius; it ran for 157 performances.He followed it with "The Shoemaker's Holiday" (1938) and "Danton's Death" (1938) for Welles.Cotten also performed in radio dramas presented on "The Mercury Theatre on the Air" and "The Campbell Playhouse".