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 |
| Crew | Paul Desmuke | Stunt Double |
| Sound | Sam Feinberg | Musician |
| Writing | Tod Browning | Story |
| Camera | Clarence Sinclair Bull | Still Photographer |
| Sound | Jack Feinberg | Musician |
| Directing | Harry Sharrock | Assistant Director |
| Costume & Make-Up | Lucia Coulter | Wardrobe Supervisor |
| Editing | Harry Reynolds | Editor |
| Editing | Errol Taggart | Editor |
| Crew | Joseph Farnham | Title Graphics |
| Art | Cedric Gibbons | Art Direction |
| Art | Richard Day | Art Direction |
| Writing | Waldemar Young | Screenplay |
| Costume & Make-Up | Lucia Coulter | Costume Design |
| Production | Irving Thalberg | Producer |
| Writing | Joseph Farnham | Writer |
