Matango

Honda's mushroom-people film, and by far the bleakest thing Toho made in this era. Shipwrecked pleasure-seekers wash up on an island where the only food is a fungus that slowly transforms whoever eats it, and the film becomes a claustrophobic study of a small group turning on each other.

It is genuine psychological horror rather than monster spectacle, a grim parable about appetite and social collapse, and the transformations are unsettling. The cynicism is startling for the studio and the period.

Toho's most disturbing film, and one of its most underrated.