Before the outbreak of WWII, Nazi sympathizers plot to undermine America.
| Actor | Role |
|---|---|
 Milburn StoneAgent Tom Brant | Agent Tom Brant |
 Jan WileyJanet Lowe | Janet Lowe |
 Dennis MooreJack Ryan | Jack Ryan |
 Addison RichardsGerhard Doenitz / Garret Donahue | Gerhard Doenitz / Garret Donahue |
 Byron FoulgerProf. Elwood Henderson | Prof. Elwood Henderson |
 Maris WrixonDorothy Newton | Dorothy Newton |
 Sarah PaddenAggie | Aggie |
 George LynnHerman | Herman |
 Russell HicksPolice Chief Michael J. O'Brien | Police Chief Michael J. O'Brien |
 Roland VarnoArnold Hoffman | Arnold Hoffman |
 Lash LaRueMigsy | Migsy |
| JJerry ShaneDan | Dan |
 Neyle MorrowSpike | Spike |
 John EldredgeWalter Stark | Walter Stark |