Lightnin' the dog and his master, Tom Harding are on to a group of smugglers who operate down at the harbor. Tom nearly bags them, but he's overwhelmed and they take flight. His girlfriend bluffs her way into the gang's hideout, but is discovered and held back. Tom is again overpowered by the crooks and thrown in a secret dungeon, but he fights his way out.
| Actor | Role |
|---|---|
 Lightning the German ShepherdLightnin' - the Super Dog | Lightnin' - the Super Dog |
 Gary CooperTom Harding | Tom Harding |
 Eileen SedgwickBabe the Vamp | Babe the Vamp |
 Frank LackteenThe Master Criminal | The Master Criminal |
 Zalla ZaranaMazie La Fere | Mazie La Fere |
 Walter MalyRandall Myers | Randall Myers |