The Omega Man (1971)**
I'm not quite sure what got into Charlton Heston in the late 60's/early 70's, but he made 3 iconic sci-fi dystopian pictures almost in a row: Planet of the Apes, Soylent Green, and this one. Very cynical, very bleak, very depressing views of humanity, full of interesting ideas, but, except for "Apes", made on a shoestring budget and sorely lacking in imagination. I kind of admire Heston for taking chances like this even though he sometimes is woefully miscast. "Omega" is competent, kids will find it scary.