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Richard Webb

Lane Carson

Aline Towne

Carol Richards

Lane Bradford

Burton

Stanley Price

The Phantom Ruler

John Crawford

Harris

George Meeker

Harry Long

Keith Richards

Doctor [Ch.12]

Dale Van Sickel

Otto Wagner…

Tom Steele

Bill 'Mack' Haines [Chs. 5,10]

Marshall Reed

MacDuff - Roadblock Cop [Chs.1, 7-9]

Forest Burns

Joe - Watchman [Ch.5]
(as Forrest Burns)

Eddie Parker

Stoner - Barn Henchman[Ch.9]
(as Ed Parker)

Frank O'Connor

Hogan [Ch.5]

Charles Regan

Art
(as Chas Regan)

Charles Sullivan

Grogarty - Squad Car Cop [Chs.7-8]

Howard M. Mitchell

Second Garage Watchman [Ch.7]
(as Howard Mitchell)

Bud Wolfe

Harding - Henchman [Ch.8]

Douglas Evans

James Hunter [Chs. 1, 3, 7, 12]
(uncredited)

Director
- Fred C. Brannon
Writer
- Ronald Davidson
All cast & crew
Production, box office & more at IMDbPro

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Trivia
CHAPTER TITLES: 1. Slaves of the Phantom; 2. The Acid Clue; 3. The Death Car; 4. Highway Holocaust; 5. Bridge to Eternity; 6. Ordeal by Fire; 7. Murder Train; 8. Window of Peril; 9. Trail to Destruction; 10. High-Voltage Danger; 11. Death's Highway; 12. The Phantom Meets Justice.

Goofs
Although 'Charles Regan' is listed in screen and press cast, he did not appear in this film.

Connections
Edited into Slaves of the Invisible Monster (1966)

If you haven't seen many serials, this would be a good start. If you're a serial veteran, you'll recognize almost all of the cliffhanger endings, which have been lifted from other Republic serials. Richard Webb, later TV's Captain Midnight, delivers a stiff performance and a lot of punches: at least one set per chapter is demolished in a slugfest. John Hamilton, TV's Perry White in Superman, has a small part in the first and final chapter. For plot, there's even less logic than usual: bad guy wants to take over world with an army of invisible soldiers, but can barely manage to keep himself invisible. Overall, below average.