Cpl. Greg Carroll | |
 | Sgt. Paul, the traitor |
 | Lt. John Harmon |
 | Linda |
 | Elevator Operator |
 | Agent Martin, military intelligence |
 | Capt. Bryant |
 | Sgt. Blake |
 | Agent Wallace, military intelligence |
 | Col. Longstreet |
 | Carl Flegler, the cobbler-spy |
 | Stanley Hume, fifth columnist |
 | Capt. Gray |
 | Harold, professor's aide |