Charlton Heston

Maj. Bernard R. 'Barney' Benson

Julie Adams

Dr. Kay Lambert

William Demarest

John

Tim Hovey

Cadet Thomas 'Tiger' Flaherty

Nana Bryant

Mother Redempta

Tim Considine

Cadet Lt. Gerald Hibler

Sal Mineo

Cadet Col. Sylvester Dusik

Milburn Stone

Maj. Gen. Wilton J. Ramsey

Mary Field

Sister Mary Theresa

Joey D. Vieira

Cadet Cpl. Scawalski (as Donald Keeler)