Special Guest Stars James Daly as Gen. Samuel Arlington Concannon Guest Stars Kent Smith as Edgar Scoville Linwood McCarthy as Col. Archie Harmon Alfred Ryder as The Invader Leader Phyllis Thaxter as Sarah Concannon Co Starring Jack Bannon as Junior Officer Jan Merlin as Post Byron Keith as Gen. Cullenbine Larry Thor as Dr. Jacobs Pat Cardi as Bill Concannon Ed Deemer as Air Policeman Craig Huebing as Willard