Zardoz

This science-fiction film takes place in a future world where the human race is controlled by a small group of people who have discovered the secret of eternal life and pose as gods to the less fortunate humans. Using the savage people as workers and slaves and the rest as an enforcement unit known as the Exterminators, the Eternals are able to keep themselves alive in a protected area. However, when Zed, an Exterminator, discovers their secret, the Eternals' sheltered, manipulative way of life is threatened. (All Movie Guide, Iotis Erlewine)