Varan

Entomologists in the Tohoku region In Japan stumbles upon a primitive tribe, warning them of a monster legend known as Baradagi. However, the legend turns out to be true, and the monster awakens and heads toward Tokyo.

Varan is a 1958 horror sci-fi movie, starring Akihiko Hirata, Kôzô Nomura, Koreya Senda. It holds an IMDb rating of 5.3/10 from 1,103 votes and runs 1h 27m.