 Hop Harrigan (William Bakewell), a top Air Corps pilot, leaves the military and he and his mechanic, "Tank" Tinker (Sumner Getchell), open up a small charter air service.They are hired by J. Westly Arnold (Emmett Vogan) to fly an inventor, Dr. Tabor (John Merton), to his secret laboratory, where he is working on a new and powerful energy machine.A mysterious villain named "The Chief Pilot" (Wheeler Oakman), however, is also determined to have the new energy machine for his own purposes.