Distributor: Mascot Pictures Corporation
Release Date: August 1, 1935 (premiere), August 31, 1935
Runtime: 229 min. (12 chapters)
Alternative Titles: None
Tagline: Island of Sujan... Infested With Strange Beasts... Place of Lurking Dangers...

Cast and Characters

• Rex- Rex, The King of Wild Horses
• Rin Tin Tin Jr. - Rinty
• Kane Richmond - Frank Bradley
• Norma Taylor - Dorothy Bruce
• Mischa Auer- Tanaga [Chapters 1, 4, 8, 10-12]
• Smiley Burnette- Jensen
• Harry Woods - Crawford
• Pedro Regas - Pasha [Chapters 1-4, 7-11]
• Hooper Atchley - Debor [Chapters 11-12]
• Wheeler Oakman - Henchman Wheeler
• Victor Potel - Kinso, Royal Guard Commander [Chs. 1, 10-12]
• Allan Cavan - Mr. Bruce [Chs. 1-3, 9]
• Al Bridge - Henchman Mitchell [Chs. 1-6, 10]
• Edmund Cobb - Henchman Jones
• Charles King - Henchman Martin
• George Chesebro - Henchman Anderson
• Jack Rockwell - Henchman McDonald
• Ralph Byrd - Forest Ranger Jerry Morton [Chs. 5-6]
• Jack Cheatham - First Policeman [Chapter 1](uncredited)
• Tracy Layne - Henchman Buck [Chapters 9-10](uncredited)
• Wilfred Lucas- Frank Hammond (uncredited)
• Frankie Marvin - Guard [Chapters 11-12](uncredited)
• Eddie Parker - Guard (uncredited)
• Max Wagner - Tramp [Chapter 5](uncredited)

Crew

• Directed by: Ford Beebe , B. Reeves Eason
• Screenplay: John Rathmell , Barney A. Sarecky
• Story: B. Reeves Easton, Maurice Geraghty , Ray Trampe
• Producer: Nat Levine
• Supervising Producer: Barney A. Sarecky
• Original Music: Jean Aberbach (undcredited), Charles Dunworth (uncredited)
• Musical Director: Lee Zahler
• Cinematography: William Nobles
• Editor: Richard Fantl (as Dick Fantl), Joseph H. Lewis
• Supervising Editor: Joseph H. Lewis
• Sound Effects Editor: Roy Granville
• Sound Engineer: Clifford A. Ruberg (as Cliff Ruberg)
• Stunts:Tracy Layne , Ted Mapes , Eddie Parker , Joe Yrigoyen (all uncredited)