Cole Hillman's Arizona ranch is plagued with 'mongrel' rabbits, and he wants to employ an ecologically sound control method. As a favor to college benefactor Hillman, college president Elgin Clark calls in zoologist Roy Bennett to help. Bennett immediately begins injecting rabbits with hormones and genetically mutated blood in an effort to develop a method of disrupting rabbit reproduction. One of the test subjects escapes, resulting in a race of bloodthirsty, wolf-sized, man-, horse-, and cow-eating bunnies. Eventually the National Guard is called in for a final showdown with the terrorizing rabbits.

As a result of an arctic nuclear test, a carnivorous dinosaur thaws out and starts making its way down the east coast of North America. Professor Tom Nesbitt, only witness to the beast's existence, is not believed, even when he identifies it as a "rhedosaurus" to paleontologist Thurgood Elson. All doubts disappear, however, when Elson is swallowed whole during an oceanic bathysphere excursion to search for the creature. Soon thereafter the rhedosaurus emerges from the sea and lays waste to Manhattan Island until Nesbitt comes up with a plan to try to stop the seemingly indestructible beast.

When an errant bomb unearths the coffin of a vampire during the London Blitz, a gravedigger unknowingly reanimates the monster by removing the stake from his heart