Frank McIntosh
Dr. Bruce Kimball
U. N. Official #1
Sgt. Topf
Military Computer Entry - Missile Launch (uncredited)
Larry Hamilton
TV Reporter
Man (uncredited)
Bob Sibley
Slow Boy (uncredited)
Party Guest
Patrolman
C-47 Transport Pilot (uncredited)
Fred Dunbar
David Callaway
Duty Officer
Judge
Harper
Jay Simmons
Atherton
Mr. Brooks
Newscaster
Telegraph Operator
Emmet
John Tremont
Harkness
Agent
Agent Mark Kress
Agent Davis
Ernest Fields
Paul Soren
Devore
Crawford
Dr. Whitmore
Professor Whitmore
Amos
Anchor Man
Russ
Dr. Barnes
Brendan Riley