During WWII a Japanese prisoner transport is torpedoed at sea. Two convicts, one Japanese (Dean Fujioka), the other British (Callum Woodhouse), are washed ashore on a deserted island. As the two adversaries are suddenly equalised by circumstance and nature, they immediately embrace conflict and, eventually, mutual understanding, in a manner not too dissimilar to the start of Kong Skull Island, or countless episodes of Star Trek.
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https://screenrealm.com/monster-island-movie-review-shudder-horror-film-orang-ikan/
IMDB: Monster Island (Orang Ikan)