The Fighting Devil Dogs (1938) is a 12-chapter Republic movie serial starring Lee Powell and Herman Brix, the latter better known by his later stage name, Bruce Bennett. It was directed by William Witney and John English. While not often considered a great serial, as it contains much stock footage and two recap chapters, it is famous for its main villain, the Lightningthe first costumed supervillain. There is some speculation that George Lucas used the Lightning as a template for Darth Vader.

Plot

In Singapore, two Marine Lieutenants, Tom Grayson and Frank Corby, uncover the threat of a masked terrorist called the Lightning, who uses an arsenal of powerful lightning-based weaponry in his bid for world conquest. However, the battle becomes personal when the Lightning annihilates the officers' unit and later kills Lt. Grayson's father as he was helping the investigation of the weapon. Now, the marines have dedicated themselves to stopping the Lightning and bringing him to justice.