After a space merchant vessel perceives an unknown transmission as distress call, their landing on the source planet finds one of the crew attacked by a mysterious lifeform. Continuing their journey back to Earth with the attacked crew having recovered and the critter deceased, they soon realize that its life cycle has merely begun.
A giant great white shark arrives on the shores of a New England beach resort and wreaks havoc with bloody attacks on swimmers, until a part-time sheriff teams up with a marine biologist and an old seafarer to hunt the monster down.
A wealthy San Francisco socialite pursues a potential boyfriend to a small Northern California town that slowly takes a turn for the bizarre when birds of all kinds suddenly begin to attack people there in increasing numbers and with increasing viciousness.
Several people are hunted by a cruel serial killer who kills his victims in their dreams. While the survivors are trying to find the reason for being chosen, the murderer won't lose any chance to kill them as soon as they fall asleep.