Several iterations of The Adventures of Ellery Queen appeared on different networks, with the first one broadcast on CBS June 18, 1939, and the last on ABC May 27, 1948. The show grew out of the combined efforts of producer-director George Zachary and writers Frederic Danny and Manfred Lee. Dannay and Lee, who were cousins, originated the Ellery Queen character. Initially they wrote the program's scripts, and Zachary handled production. Beginning in 1945, Anthony Boucher replaced Dannay and worked with Lee writing scripts.
The primary characters and those who played each role were as follows:
* Ellery Queen was played by Hugh Marlowe (1939-1940), Carleton Young (1942-43), Sydney Smith (1943-44, 1945-47), Lawrence Dobkin (1947-48) and Howard Culver (1948).
* Richard Queen - Ellery's father was a police inspector,played by Santos Ortega (1939-1947), Bill Smith (1947) and Herb Butterfield (1947-1948).
* Nikki Porter - A character who had not appeared in the Ellery Queen written material, Porter was added to the program as Ellery's secretary in order to provide 'love interest' that was supposed to attract the female audience." She was played by Marion Shockley (1939-1944), Barbara Terrell (1945), Gertrude Warner (1945-46), Charlotte Keane (1946-47), Virginia Gregg (1947) and Kaye Brinker (1948).
* Sergeant Velie - Inspector Queen's assistant,was played by Howard Smith (1939), Ted de Corsia (1939-47), Ed Latimer (1947) and Alan Reed (1947).
Announcers were Ken Roberts (1939-40), Bert Parks (1940), Ernest Chappell (1942-44), Don Hancock (1947), and Paul Masterson (1947). (Source: wikipedia.org)