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You can stream Varan (1958) on Criterion Channel with a subscription.

When a rare species of butterfly is found in a mysterious valley in Japan, a pair of entomologists go to investigate and find more. They discover Varan, a giant monster, who decides to leave the valley and head straight for Tokyo.

An entomological expedition into a hidden valley quickly spirals into a nightmare when a prehistoric behemoth emerges from the shadows. This creature feature trades polished effects for a raw, feverish energy that captures the chaotic terror of a monster marching toward Tokyo.