Soylent Green

Set in a polluted, congested New York City in 2022, this sci-fi thriller stars Charlton Heston as Robert Thorn, a gumshoe looking into the murder of a corporate executive (Joseph Cotten) whose company makes a nutritious synthetic food called Soylent Green. But in the process of tracking down the killer, Thorn unearths shocking information about the product's ingredients. The cast also includes the great Edward G. Robinson in his last film role.