Fed up with the bunnies hopping across their land, a group of ranchers tries to stunt the rabbits' growth with a hormone. But instead of reducing the bunny populace, it makes the animals 150 pounds larger and gives them an appetite for human flesh. Are the ranchers any match for the ravenous rabbits' reproductive skills? Stuart Whitman, Janet Leigh and DeForest Kelley head the cast in this cautionary sci-fi tale.