Frankie Thomas
Tim Tyler
Frances Robinson
Lora Lacey
Jack Mulhall
Sgt. Gates
Al Shean
Professor Tyler
Norman Willis
Spider Webb
Anthony Warde
Garry Drake
Earl Douglas
Jules Lazarre
William Benedict
Spud
Frank Mayo
Jim Conway
Alan Gregg
Brent
Stanley Blystone
Capt. Clark
Everett Brown
Mogu
Skippy
JuJu
Ernie Adams
Henchman Becker
Ed Brady
Ivory Patrol Lieutenant
Al Bridge
Capt. Trowbridge
Lane Chandler
Patrolman Kelly
William Desmond
Dock Official
Kenneth Harlan
Spencer, Trader
Ethan Laidlaw
Patrol Guard Rocky
William McClain
Native
Chuck Morrison
Henchman
Charles Murphy
Henchman
Forbes Murray
The Doctor
Pat J. O'Brien
Patrolman Berry
Eddie Parker
Henchman
Tom Steele
Ivory Patrolman
Charles Sullivan
River Boat Crewman / Henchman
Harry Wilson
Henchman