Mercury Summer Theater AIRED 1946 07 12 on CBS Radio. Episode 06 "Search For Henri Lefevre". An original story for radio by Lucille Fletcher This series produced, directed by and starring Orson Welles. It was a short-lived summer radio series sponsored by Pabst Blue Ribbon, on Friday evenings at 10 p.m. ET lasting 15 episodes. It harked back to Welles's earlier The Mercury Theatre on the Air (1938) and its successor, The Campbell Playhouse.