Mystery Mountain (1934)

Directed by  Otto Brower & B. Reeves Eason
Cast:
Ken Maynard .... Ken Williams
Tarzan .... Tarzan (Ken's horse)
Verna Hillie .... Jane Corwin
Syd Saylor .... Breezy Baker
Edward Earle .... Frank Blayden
Hooper Atchley .... Dr. Edwards
Edward Hearn .... Lake
Al Bridge .... Tom Henderson
Bob Kortman .... Rattler Henchman Hank
Lew Meehan .... Rattler Henchman Red
George Chesebro .... Rattler Henchman Anderson
Tom London .... Rattler Henchman Morgan
Lynton Brent .... Mathews, Telegrapher

Chapter Titles:
1. The Rattler - 2. The Man Nobody Knows
3. The Eyes That Never Sleeps - 4. The Human Target
5. Phantom Outlaws - 6. The Perfect Crime
7. Tarzan the Cunning - 8. The Enemy's Stronghold
9. The Fatal Warning - 10.The Secret of the Mountain
11.Behind the Mask - 12.The Judgement of Tarzan

Ken Williams is determined to discover the identity of the mysterious
Rattler, who preys upon railroads and transportation companies like
that owned by Jane Corwin. The Rattler is especially difficult to
catch because of his skill at disguising himself as other people
220 Minutes