In this giant-creature feature, a man drives into town to buy a birthday present for his teenage daughter, Carol (June Kenney), and meets a horrific catastrophe. The next day, Carol enlists the help of her boyfriend, Mike (Gene Persson), to track down her dad. The kids trace his path to an eerie cave containing a super-sized spider and barely escape with their lives. Naturally, the sheriff (Gene Roth) doubts their story until it's too late, and the tarantula has taken over the town.