Nobita caught a big rhinoceros beetle which he promises to his dad to take good care of. Later, Doraemon's group found a strange island where a tribe co-exists with prehistoric creatures who were considered extinct. They find that a mythical beetle God, Golden Heraklex was protecting this island, giving it the powers to sustain the life of a prehistoric species. Yet, the group has to deal with a group of criminals from the future who wants to possess Heraklex for money and power.
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