 William PowellAndrew Gentling | Andrew Gentling |
 Shelley WintersCatherine Sykes | Catherine Sykes |
 Marsha HuntMartha Wier | Martha Wier |
 Dorothy HartHelen Gentling | Helen Gentling |
 James GleasonCaptain Gledhill | Captain Gledhill |
 Felix BressartProfessor Morris Avrum | Professor Morris Avrum |
 Art BakerHenry Pritchard | Henry Pritchard |
 Sheldon LeonardDetective Pacciano | Detective Pacciano |
 Howard FreemanDr. Markheim | Dr. Markheim |
 Houseley StevensonMontgomery Thatcher | Montgomery Thatcher |
 Paul HarveyMr. Arnspiger | Mr. Arnspiger |
 Francis PierlotDr. Herbert Watson | Dr. Herbert Watson |
 Jess BarkerArnold Sykes | Arnold Sykes |
 Mikel ConradFreddie Blair | Freddie Blair |
| VVangie BeilbyOld Lady at Lecture (uncredited) | Old Lady at Lecture (uncredited) |
 Marjorie BennettWaitress (uncredited) | Waitress (uncredited) |
 Leonard BremenTruck Driver (uncredited) | Truck Driver (uncredited) |
 Paul BrinegarReporter (uncredited) | Reporter (uncredited) |
 Frank CadyReporter (uncredited) | Reporter (uncredited) |
 Edmund CobbPoliceman (uncredited) | Policeman (uncredited) |
| HHelen CrozierMaid (uncredited) | Maid (uncredited) |
 Johnny DuncanBellhop (uncredited) | Bellhop (uncredited) |
 Adolph FaylauerBald Man at Lecture (uncredited) | Bald Man at Lecture (uncredited) |
 Sandra GouldNewspaper Girl (uncredited) | Newspaper Girl (uncredited) |
| EEthyl May HallsWoman at Window (uncredited) | Woman at Window (uncredited) |
 Chuck HamiltonPoliceman (uncredited) | Policeman (uncredited) |
 Herbert HeywoodAttendant (uncredited) | Attendant (uncredited) |
 Tommy IvoHorace - Boy at Roadblock (uncredited) | Horace - Boy at Roadblock (uncredited) |
 Lyle LatellReporter (uncredited) | Reporter (uncredited) |
 George LynnPoliceman (uncredited) | Policeman (uncredited) |
