Soylent Green is landmark screen science-fiction, a riveting entertainment and a cautionary tale that holds a mirror to a tomorrow rife with ecological disaster. Working well again in the futuristic genre following Planet of the Apes and The Omega Man, action titan Charlton Heston portrays Thorn, a detective prowling the dank streets of a polluted, overpopulated Big Apple gone rotten in 2022. He's trailing a murderer -- and the trail leads to a stunning discovery. Vividly realized, Soylent Green's world gains its power not just from its special effects but from its heart -- a human dimension magnified by the performance of legendary Edward G. Robinson in his moving screen farewell.