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Choice dialogue:
“Look I don’t know whether you can hear me but if you can, you listen good! I hate your living guts for what you’ve done to my husband and my world. I know you for the coward you are and I’m gonna kill you! Do you hear that? I’m gonna kill you!”

Cast and characters:
Peter Graves … Doctor Paul Nelson
Beverly Garland … Claire Anderson
Lee Van Cleef … Doctor Tom Anderson
Sally Fraser … Joan Nelson
Russ Bender … Brig. Gen. James Pattick
Jonathan Haze … Pvt. Manuel Ortiz
Dick Miller … Sgt. Neil
Taggart Casey … Sheriff N.J. Shallert
Paul Harbor … Floyd Mason
Karen Kadler … Ellen Peters (as Karyne Kadler)
Charles B. Griffith … Doctor Pete Shelton (as Charles Griffith)
Marshall Bradford … U.S. Secretary Platt (as Marshal Bradford)
Thomas E. Jackson … George Haskell (as Tom Jackson)
David McMahon … General Carpenter
Jim Knight … Bazooka Soldier
Paul Blaisdell … The Monster [uncredited]
Filming locations:
2693 N. Beachwood Drive, Los Angeles, California (Clarion newspaper office) (now a cafe)
2740 N. Beachwood Drive., Los Angeles, California (Nelson house)
Beachwood Market, 2701 Belden Drive, Hollywood, Los Angeles, California (evacuation street scene)
Bronson Cave, Bronson Canyon, Griffith Park – 4730 Crystal Springs Drive, Los Angeles, California (alien in hiding)
Universal Studios – 100 Universal City Plaza, Universal City, California (studio)
Filming dates:
From 5th April 1956
Technical details:
1 hour 11 minutes
Audio: Mono (Ryder Sound Services)
Black and white
Aspect ratio: 1.85: 1
Release:
The film was released theatrically by American International Pictures on a double-bill with The She-Creature.