A Boy and His Dog (1975)
After WWIII, Vic and his telepathic dog wander a post apocalyptic wasteland in 2024 as they scavenge for food and sex They stumble into an underground society where the old ways are preserved He finds a new purpose in his life
The Brotherhood of Satan (1971)
A family is trapped in a desert town by a cult of senior citizens who recruit the towns children to worship Satan