This film cannot be spoiled; its value comes from experiencing the film itself. You could focus upon the plot of a man distressed by his former wife's remarriage, but the core of appreciation comes when the viewer, with Morgan, realizes that when we chose our skins, our outward appearance, we may mask even from ourselves our inner selves. We roar with laughter as Morgan flees in a burning gorilla suit, then discover real inner terror when he stops.
It helps if one understands the references to Marx and the loose grip on reality evidenced by Morgan's mother, and by implication Marx himself, but the final scene, with one amazing image, sums up the film.
It helps if one understands the references to Marx and the loose grip on reality evidenced by Morgan's mother, and by implication Marx himself, but the final scene, with one amazing image, sums up the film.