A mother (Patty Duke) goes to Chicago to try to find her son (Robert Floyd) who has suddenly quit contacting her and can’t be reached.

250 million years ago, a carnivorous species ‘planted’ a crop of humans on an uninhabited planet known as Earth. Now, the alien life form has returned to harvest its yield….

Mutual friends Barbara and Genevieve are both sleeping with District Attorney Sam Brady. When they become aware of their bizzare love triangle, they plot against him.