the time be the future and for many not aware of it and that day be now . in this final movie for legendary actor and edward g. robinson and solent green become a landmark classic . many a film buff and environmentalist believe this be our eventual history . the movie be take from the novel entitle and make room and make room but who work title be change to solent green . the story concern the earth a it evolve into the future with the world environmental problem become nothing short of catastrophic . the planet natural resource have be exhaust and basic food have be reduce to simple staple . they come in a variety of color and such a solent yellow and solent red and and now solent green . however there be those who know the real ingredient in solent green and cringe at their own culpability and fear divine retribution . the first be a food executive name william r. simonson ( joseph cotton ) . upon his death and a dedicated police detective call robert thorn ( charleston heston ) seek the truth behind his apparent suicide . although corruption go all the way to the top and it begin with simonsons bodyguard and tad fielding ( chuck connors ) and security chief donnovan ( roy jenson ) who target thorn for a waste desposal factory . thorn bos and lt. hatcher ( brock peter ) believe his suspicion but warn him of those high and hot who want the case close and but thorn will not risk his job for an easy way out . what thorn discovers mark him for death and but like the film and await a final warning . .