Hop Harrigan, a top Air Corps pilot, leaves the military and he and his mechanic, Tank Tinker, open up a small charter air service. They are hired to fly an inventor, Dr. Tabor, to his secret laboratory, where he is working on a new and powerful energy machine. However, a mysterious villain named The Chief Pilot is determined to have the new energy machine for his own purposes and kidnaps Dr. Tabor.
William Bakewell
as Hop Harrigan
Jennifer Holt
as Gail Nolan
Robert "Buzz" Henry
as Jackie Nolan
Sumner Getchell
as Tank Tinker
Emmett Vogan
as J. Westly Arnold
Claire James
as Gwen Arnold
John Merton
as Dr. Tobor
Wheeler Oakman
as Alex Ballard
Ernie Adams
as Retner
