Jack Flynn is driving down a highway at night, looking at a bracelet he has bought his daughter for her birthday, when he hits something and his vehicle crashes. The next morning, his teenage daughter Carol is concerned that her ne'er-do-well father did not come home last night. She convinces her boyfriend Mike to assist in a search for her father. They find his crashed truck and the bracelet, but not his body. Thinking he crawled into a nearby cave, they investigate. In the cave, they fall onto the gigantic web of an enormous tarantula, which emerges from behind some rocks to attack them. They manage to escape and make it back to town.