 Jean MuirEllen Haslett | Ellen Haslett |
 Barton MacLaneAndrew Beaupre | Andrew Beaupre |
 Henry O'NeillDr. Thomas Haslett | Dr. Thomas Haslett |
 Robert BarratMartin Crane | Martin Crane |
 Addison RichardsJohn McNally | John McNally |
 Helen MacKellarMrs. Mary Haslett | Mrs. Mary Haslett |
 Gordon OliverPete Lawson | Pete Lawson |
 Joseph CrehanDr. Stuart Hunter | Dr. Stuart Hunter |
| PPriscilla LyonSuzanne Haslett | Suzanne Haslett |
 Walter MillerMaxwell | Maxwell |
 Herbert HeywoodSteve | Steve |
 Ben Hendricks Jr.Captain Harper | Captain Harper |
| TTom BrownerNewspaper Reader (uncredited) | Newspaper Reader (uncredited) |
 Eddy ChandlerDriller (uncredited) | Driller (uncredited) |
| NNeal DoddPriest (uncredited) | Priest (uncredited) |
 Sam HayesRadio Announcer (uncredited) | Radio Announcer (uncredited) |
| HHenry OthoGene - Rescue Worker (uncredited) | Gene - Rescue Worker (uncredited) |
 Paul PanzerPierre - Man Carrying Injured Suzy (uncredited) | Pierre - Man Carrying Injured Suzy (uncredited) |
 Russ PowellToby - the Bartender (uncredited) | Toby - the Bartender (uncredited) |
 Dick PurcellTrapped Draegerman (uncredited) | Trapped Draegerman (uncredited) |
 John J. RichardsonJack - Pete's Co-Worker (uncredited) | Jack - Pete's Co-Worker (uncredited) |
 Myrtle StedmanNurse (uncredited) | Nurse (uncredited) |
