USA
On a volcanic island near the kingdom of Hetvia rules Count Dakkar, a benevolent leader and scientist who has eliminated class distinction among the island's inhabitants. Dakkar, his daughter Sonia and her fiance, engineer Nicolai Roget have designed a submarine which Roget pilots on its initial voyage just before the island is overrun by Baron Falon, despotic ruler of Hetvia. Falon sets out after Roget in a second submarine and the two craft, diving to the ocean's floor, discover a strange land populated by dragons, giant squid and an eerie undiscovered humanoid race. - IMDb
| Den hemlighetsfulla ön |  Sweden |
| Den hemmelighedsfulde Ø |  Denmark |
| Den hemmelighetsfulle ø |  Norway |
| I mystiriodis nisos (transliterated title) |  Greece |
| L'île mystérieuse |  France |
| Ilha Misteriosa |  Brazil |
| A Ilha Misteriosa |  Portugal |
| La isla misteriosa |  Spain |
| La isla misteriosa |  Venezuela |
| L'isola misteriosa |  Italy |
| Die Mysteriöse Insel |  West Germany |
| The Mysterious Island |  United Kingdom |
| The Mysterious Island | USA |
| Rejtelmes sziget |  Hungary |
| Tajanstveno ostrvo |  Serbia |
| Tajemnicza wyspa |  Poland |
| Taynstveniyat ostrov |  Bulgaria |
| Таинственный остров |  Soviet Union |
| 龍宮城 |  Japan |
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Billy Schuler | Undetermined Secondary Role |
