Leif Erickson as Marty Treleavan

Doug McClure as George Spencer

Roddy McDowall as Dr. Ralph Baird

Lois Nettleton as Janet Turner

Keenan Wynn as Milton

Jack Ging as Controller

Sam Melville as Stewart

Leonard Stone as Harry Burdick

Sidney Clute as Mr. Swenson

Christopher Dark as Mr. McCann

Loretta Leversee as Mrs. McCann

Patricia Mattick as Ellen

Victor Izay as Second Man

Kenneth Tobey as Capt. Wilson

Ed McCready as Football Fan

Kit Woodhouse as Milton's Wife

Sue Casey as Sherry

Dean Stewart as Young Man

Renny Roker as Phone Operator

David M. Frank as Ticket Agent

Robert Dowdell as Tower Radar Operator

Lee Stanley as Radio Room Operator