During WWII, a U.S. submarine crew survived after being sunk and joined Chinese insurgents. Evading the Japanese, they delivered an intel asset to the U.S. Navy amidst hilarious chaos due to the language barrier.

During WWII, a U.S. submarine was sunk by Japanese navy in Chinese waters, the survived crew united with the local Chinese anti-japan insurgents and try to rendezvous with their troops and deliver a Japanese intelligence asset Hakuko to U.S. Navy. Hilarious chaos ensued as the group evaded captures by the occupying Japanese forces, rooting out embedded Japanese spies, while the Americans and the Chinese not understanding most of each other's languages.