Unlike so many horror movie archetypes, the assistant does not have a strong predecessor on the page. In Mary Shelley’s novel, Dr. Frankenstein worked solo. In both literary and film incarnations, Dr. Jekyll never hung a “For Hire” sign outside his lab. Our closest literary forerunner of the assistant is R.M. Renfield. In Bram Stoker’s Dracula, the zoophagous maniac is much more limited than he would be on screen. In a novel sprawling with characters, Renfield is a relatively minor one, only mentioned on twelve dates of its epistolary pages. As an inmate in Dr. Seward’s asylum, Renfield’s main plot function is to invite Count Dracula into the building so he can get his fangs on Mina (as film adaptations sometimes forget, Dracula can’t just go anywhere he pleases). Thematically, he mostly serves as a comic reflection of the dead-somber Count, eating the small lives of bugs and spiders while his master sups on more substantial fare. His naked escapes into the night parody Dracula’s less absurd nocturnal, erotically tinged escapades. Mina’s visit in Renfield’s cell inverts Dracula’s intrusions into her bedroom. Dracula enters Mina’s room to impose his evil on her, to possess her. When Mina enters Renfield’s, she has the opposite effect, seemingly making him saner, more coherent, a better person more concerned with her safety than worshipping his master. By imploring her to free herself from Dracula’s thrall, Renfield earns himself a fatal thrashing from the vampire.
Renfield underwent significant alterations in the first feature adaptation of Dracula. In F.W. Murnau’s Nosferatu, he has been renamed Knock in keeping with other such attempts to wriggle around Florence Stoker’s copyright claims. Instead of beginning the story as an asylum inmate, he is Thomas Hutter’s (our Jonathan Harker stand-in) boss, who deploys him to Count Orlok’s (Dracula’s) castle.
Garrett Fort put his own spin on this revised Renfield in his screenplay for Universal’s 1931 film, changing the character forever. Harker’s visit to Castle Dracula is handed over to Renfield completely, leaving our protagonist with a drastically reduced role and our secondary antagonist with a vastly expanded one. Played by David Manners, Harker is a bland, background figure in Tod Browning’s film. Dwight Frye’s Renfield commands the screen every time he appears. He exudes personality even before Dracula impels him toward madness (Stoker’s Renfield was already mad and institutionalized when the Count took him into his employ). Frye plays the sane Renfield with a magnetic blend of terror (how his eyes widen when he sees that rubber bat flapping over the carriage!) and amiability (his joyful declaration that the “very old wine” is “delicious!” is delightfully sincere when set against the Count’s weirdness). Considering how vacant most of the cast is, Renfield is the character we’d most like to know in Dracula. That also means he is the most tragic figure. Dracula’s treatment of Renfield is painful to watch, from his mesmerized madness to his murder.