Bobby Van as Danny

Ruta Lee as Dr. Marion Turner

Mala Powers as Maj. Georgianna Bronski

James Craig as Dr. Haines

Grant Williams as Maj. Kurt Mason

Henry Wilcoxon as Dr. Christopher Perry

Essie Lin Chia as Girl Spy

Casey Kasem as Mission Control Officer

Lorri Scott as Lt. Katie Carlson

Denny Miller as Col. Don Price

Mike Farrell as 1st Reporter

Mark Bailey as Major / Astronaut

Mary Meade as Woman Reporter

John Cestare as

Raymond Mayo as

Michael Christian as