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 HBO Max.
| Directing | Stephen Weeks | Director |
| Production | Milton Subotsky | Producer |
| Production | Max Rosenberg | Producer |
| Writing | Robert Louis Stevenson | Novel |
| Writing | Milton Subotsky | Screenplay |
| Directing | Michael Stevenson | Second Assistant Director |
| Sound | Michael P. Redbourn | Sound Editor |
| Sound | Carl Davis | Original Music Composer |
| Production | Ronnie Curtis | Casting |
| Costume & Make-Up | Peter Frampton | Makeup Artist |
| Sound | Buster Ambler | Sound Mixer |
| Directing | Al Burgess | First Assistant Director |
| Editing | Peter Tanner | Editor |
| Costume & Make-Up | Harry Frampton | Makeup Artist |
| Camera | Moray Grant | Director of Photography |
| Costume & Make-Up | Joyce James | Hairstylist |
