Charlton Heston as Capt. Henry 'Hank' O'Hara

Yvette Mimieux as Angela Thacher

James Brolin as Jerome K. Weber

Claude Akins as Sgt. Ben Puzo

Jeanne Crain as Mrs. Clara Shaw

Susan Dey as Elly Brewster

Rosey Grier as Gary Brown

Mariette Hartley as Harriet Stevens

Walter Pidgeon as Sen. Arne Lindner

Ken Swofford as John Bimonte

Leslie Uggams as Lovejoy Wells

Ross Elliott as Harold Shaw

Nicholas Hammond as Peter Lindner

Mike Henry as Sam Allen

Jayson Kane as William Reading

Leoda Richards as Passenger

Lorna Thayer as Weber's mother

Maureen Connell as Mrs. O'Hara

John Hillerman as Air flight controller

Jenifer Shaw as Cosmetic Salesgirl

Wesley Lau as Stanley Morris