After Tarzan's estate is destroyed by Arabs Jane is sold into slavery by a man posing as a friendly scientist. Tarzan develops amnesia after a blow to the head. When he recovers his memory (from a later blow) he defeats the villain, recovers the fabulous jewels of Opar, and rescues Jane.
| Actor | Role |
|---|---|
 Frank MerrillTarzan / Lord Greystoke | Tarzan / Lord Greystoke |
 Natalie KingstonJane / Lady Jane | Jane / Lady Jane |
 Al FergusonAlbert Werper | Albert Werper |
 Lillian WorthQueen La of Opar | Queen La of Opar |
 Sheldon LewisAchmet Zek | Achmet Zek |
 Paul PanzerMohammed Bey | Mohammed Bey |
| CClive MorganPhilip Annersley | Philip Annersley |
 Charles GemoraTaglat the Gorilla / Chulk the Gorilla | Taglat the Gorilla / Chulk the Gorilla |
 Frank LanningWitch Doctor | Witch Doctor |