Christopher Lee stars in this Amicus production of “Dr. Jekyll & Mr. Hyde” where the names have been changed to Dr. Marlowe and Mr. Blake. Lee as Dr. Marlowe experiments with intravenous drugs that are suppose to release inner inhibitions. So comes forth Mr. Blake (also Lee) who gets more monstrous with each transformation. Peter Cushing plays his friend and colleague, Dr. Utterson.
Unfortunately the movie I, Monster is not yet available on Disney Plus.
| Directing | Stephen Weeks | Director |
| Writing | Robert Louis Stevenson | Novel |
| Production | Max Rosenberg | Producer |
| Writing | Milton Subotsky | Screenplay |
| Production | Milton Subotsky | Producer |
| Directing | Michael Stevenson | Second Assistant Director |
| Sound | Michael P. Redbourn | Sound Editor |
| Sound | Buster Ambler | Sound Mixer |
| Sound | Carl Davis | Original Music Composer |
| Costume & Make-Up | Peter Frampton | Makeup Artist |
| Directing | Al Burgess | First Assistant Director |
| Costume & Make-Up | Harry Frampton | Makeup Artist |
| Production | Ronnie Curtis | Casting |
| Editing | Peter Tanner | Editor |
| Costume & Make-Up | Joyce James | Hairstylist |
| Camera | Moray Grant | Director of Photography |
