"I find that people are always jumping to conclusions about nuclear reaction. Science fact and science fiction are not the same thing, not the same thing at all."

"From the instant they're born, they're hungry."

"Dan White — Porky Reed"

"Tyler McVey — Doc Greyson"

"Bruno VeSota — Dave Walker"

"We must remember that these creatures can travel over land, too."

"Gene Roth — Sheriff Kovis"

"Ken Clark — Steve Benton"

"Yvette Vickers — Liz Walker"

"Jan Shepard — Nan Greyson"

"Crawling horror... unleashed by the depths of hell to kill and conquer!"

"Dr. Tad Johns: As far as we know, in a man that age, only two things can cause stroke: violent anger, or fear."

"CRAWLING HORROR...THE GIANT LEECHES...RISING FROM THE DEPTHS OF HELL!"

"Fear will pierce your flesh... Until every nerve in your body... EXPLODES!"

"Michael Emmet — Cal Moulton"

"Peter Baldwin — Officer Frank Swanson"

"Robert Ivers — Harry Phillips"

"Massive Blood Sucking Monsters!"

"Gloria Talbott — Marge Bradley Farrell"

"Is it possible? Is it true? Can humans mate with MONSTERS?"

"The bride wore terror!"

"An Unknown HORROR..An Unknown DEATH.."

"Tom Tryon — Bill Farrell"

"Crawling up from the depths... to terrify and torture!"

"Kim Parker — Barbara Griselle"

"Terry Kilburn — Captain Al Chester"

"What was the terrible power of the DEMONS OF THE SWAMP?"

"Shuddery things from beyond the stars, here to breed with human women!"

"Charles Cane — Police Officer Blaine"

"Bert Freed — Police Chief A.C. Barrows"

"Prof. R. E. Walgate: What have I unleashed?"

"Douglas Kennedy — Police Officer Jackson"

"Walter Sande — Police Sgt. Mack Finlay"

"Max Wagner — Army Sgt. Rinaldi"

"Maj. Cummings: It's as if some mental vampire were at work."

"Milburn Stone — Army Capt. Roth"

"Jimmy Hunt — David Maclean"

"Leif Erickson — George MacLean"

"Prof. R.E. Walgate--- "The brain. It's gone! Sucked out like an egg between these two holes!""

"Hillary Brooke — Mary MacLean"

"Arthur Franz — Dr. Stuart Kelston"

"Mankind's oldest fear...The Alien's last conquest"

"Helena Carter — Dr. Pat Blake, MD"

"Morris Ankrum — Col. Fielding"

"Murderous Martian creatures from out of space!"

"New Horrors! Mad Science Spawns Evil Fiends! ...Taking form before your horrified eyes!"

"From out of space... came hordes of green monsters!"