Cast and credits of Federal Agents vs. Underworld, Inc.

Kirk Alyn
Insp. David Worth

Rosemary La Planche
Laura Keith

Roy Barcroft
Spade Gordon

Carol Forman
Nila

Bruce Edwards
Prof. Paul Williams [Chs. 1-6]

James Craven
Prof. James Clayton [Chs. 1, 10-12]

Tristram Coffin
Frank Chambers [Ch. 8]

Tom Steele
Grey - Henchman [Chs. 1-3] / Haskell - Pilot [Chs. 4-5] / Larkin - Henchman [Chs. 7-8] / Native #1[Ch. 11-12]

Dale Van Sickel
Mac - Henchman / False Prof. Graves [Chs. 6-7] / Cave Guard #1[Ch. 11]

Jack O'Shea
Ali [Chs. 1, 10-12]

Marshall Reed
Det. O'Hara [Ch. 9]

Robert J. Wilke
Zod - Pursuit Plane Pilot [Chs. 10-11] (as Bob Wilke)

James Carlisle
Prof. Elwood M. Graves [Ch. 6] (uncredited)

John Daheim
Cave Guard #2 [Ch.11] (uncredited)

Art Dillard
Native #2 [Chs. 11-12] (uncredited)

George Douglas
Courier (uncredited)

Sol Gorss
Digger #1 [Chs. 1, 11-12] (uncredited)

Carey Loftin
Ambulance Thug [Ch. 3] (uncredited)

Post Park
Headquarters Thug [Ch. 9] (uncredited)

Loren Riebe
Digger #2 [Chs. 1, 11-12] (uncredited)

David Sharpe
Native #4 [Ch. 11] (uncredited)

Duke Taylor
Roadblock Thug [Ch. 5] / 6th Native [Ch. 11] (uncredited)

Ken Terrell
Museum Thug [Ch. 6] (uncredited)

Bud Wolfe
Chemical Company Thug [Ch. 4] (uncredited)

Joe Yrigoyen
Roadblock Thug [Ch. 5] / Native 5 [Ch. 11] (uncredited)

Royal K. Cole
(original screenplay) and