Charlie Chan is an agent of the US government working in Washington DC and he is assigned to investigate the murder of the inventor of a highly advanced torpedo. Aiding Chan is his overeager but dull-witted son Tommy and his daughter Iris.
| Actor | Role |
|---|---|
 Sidney TolerCharlie Chan | Charlie Chan |
 Mantan MorelandBirmingham Brown | Birmingham Brown |
 Arthur LoftInspector Jones | Inspector Jones |
 Gwen KenyonInez Arranto | Inez Arranto |
 Sarah EdwardsMrs. Hargue | Mrs. Hargue |
 George J. LewisPaul Arranto | Paul Arranto |
 Marianne QuonIris Chan | Iris Chan |
 Benson FongTommie Chan | Tommie Chan |
| MMuni SeroffPeter Laska | Peter Laska |
 Barry BernardDavid Blake | David Blake |
 Gene RothLuis Philipe Vega | Luis Philipe Vega |
 Eddy ChandlerLewis | Lewis |
| LLelah TylerMrs. Winters | Mrs. Winters |