On the lam, criminal Alonzo hides in the circus as The Armless Wonder – a performer who uses his feet to hurl knives. Alonzo keeps the arms he really has concealed to hide his identity. Meanwhile, ringmaster's daughter Nanon has a phobia of being touched by men, but is romantically pursued by not only Alonzo but the strongman Malabar. Alonzo's desperation to remain with Nanon will only end in tragedy.
Unfortunately the movie The Unknown is not yet available on Disney Plus.
| Directing | Tod Browning | Director |
| Writing | Mary Roberts Rinehart | Novel |
| Camera | Merritt B. Gerstad | Director of Photography |
| Writing | Tod Browning | Story |
| Directing | Harry Sharrock | Assistant Director |
| Crew | Paul Desmuke | Stunt Double |
| Camera | Clarence Sinclair Bull | Still Photographer |
| Costume & Make-Up | Lucia Coulter | Wardrobe Supervisor |
| Sound | Jack Feinberg | Musician |
| Sound | Sam Feinberg | Musician |
| Editing | Harry Reynolds | Editor |
| Editing | Errol Taggart | Editor |
| Crew | Joseph Farnham | Title Graphics |
| Writing | Waldemar Young | Screenplay |
| Writing | Joseph Farnham | Writer |
| Art | Cedric Gibbons | Art Direction |
| Art | Richard Day | Art Direction |
| Costume & Make-Up | Lucia Coulter | Costume Design |
| Production | Irving Thalberg | Producer |
