Leif Erickson
— Marty Treleavan
Doug McClure
— George Spencer
Roddy McDowall
— Dr. Ralph Baird
Lois Nettleton
— Janet Turner
Keenan Wynn
— Milton
Jack Ging
— Controller
Sam Melville
— Stewart
Leonard Stone
— Harry Burdick
Sidney Clute
— Mr. Swenson
Christopher Dark
— Mr. McCann
Loretta Leversee
— Mrs. McCann
Patricia Mattick
— Ellen
Victor Izay
— Second Man
Kenneth Tobey
— Capt. Wilson
Ed McCready
— Football Fan
Kit Woodhouse
— Milton's Wife
Sue Casey
— Sherry
Dean Stewart
— Young Man
Renny Roker
— Phone Operator
David M. Frank
— Ticket Agent
Robert Dowdell
— Tower Radar Operator
Lee Stanley
— Radio Room Operator