 The program expanded to 30 minutes on ABC radio June 21–September 2, 1948, alternating with "Sky King".It last aired June 26–August 7, 1951, on ABC.Between 1942 and 1944, "The Sea Hound" was produced with Nelson A. Rockefeller's Office of the Coordinator of Inter-American Affairs and was part of a national program to strengthen inter-American relations.