United Kingdom
In the Nineteenth Century, in London, the psychologist Charles Marlowe researches a new drug capable to release inhibitions and uses his patients as guinea pigs. He discusses the principles of Freud with his friend Dr. Lanyon and decides to experiment his drug in himself. He becomes the ugly and evil Edward Blake and his friend and lawyer Frederik Utterson believes Blake is another person that might be blackmailing Charles. Meanwhile Charles loses control of his transformation. - IMDb
| Eu, Monstro |  Portugal |
| Eu, monstrul |  Romania |
| Fruktans monster |  Sweden |
| Hirviö |  Finland |
| I, A Monster (promotional title) |  USA |
| I, Monster |  Australia |
| I, Monster |  Canada |
| I, Monster | United Kingdom |
| I, Monster | USA |
| Ich, ein Monster |  Switzerland |
| Je suis un monstre |  France |
| Je Suis un Monstre | Canada |
| Jeg, et uhyre |  Denmark |
| Kaiki! Futatsu no kao no otoko |  Japan |
| El Monstruo de Londres |  Argentina |
| El Monstruo de Londres |  Mexico |
| El Monstruo de Londres |  Venezuela |
| El Monstruo |  Spain |
| Il mostro di Soho |  Italy |
| O drakos tou Soho (reissue title) |  Greece |
| O Soro Maldito |  Brazil |
| O vrykolakas tou mesonyktiou (transliterated title) | Greece |
| To ktinos tou Londinou (reissue title) | Greece |
| Uhyret våkner |  Norway |
| La vera storia del Dottor Jekyll | Italy |
| Я монстр |  Soviet Union |
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Chloe Franks [8] | Girl in alley |
