Harry Townes

Jim Benedict

John Agar

Col. Matthews

Whitney Blake

June

Cecil Kellaway

Dr. A.A. Andrews

Charles Aidman

Dave

Gail Kobe

Kim

Edward Platt

Dr. Easton (as Edward C. Platt)

William Traylor

Space Ship Crew

Jon Lormer

Prof. Logan

Robert Cornthwaite

Sen. Royce

Sam Edwards

Technician (uncredited)

Frank Gerstle

Member of Senate Investigating Committee (uncredited)

Biff McGuire

Technician (uncredited)

Bert Remsen

Technician (uncredited)