This is Buster Crabbe's last appearance in a serial. He was playing the part of Thunda, a character owned by Magazine Enterprises. Thunda is the only Tarzan clone to ever feature in a serial; Frank Frazetta did the art for his origin story, a story that appeared in "Thun'da, King Of The Congo #1". Ironically, Thun'Da's comic book run only lasted six issues.
For once, King is not the name of the title character's alter ego--Thunda's real name is Roger Drum. "King Of The Congo" was the epithet used to describe Thunda in the original comic.
CHAPTER TITLES: 1. Mission of Menace; 2. Red Shadows of the Jungle; 3. Into the Valley of Mist; 4. Thunda Meets His Match; 5. Thunda Turns the Tables; 6. Thunda's Desperate Chance; 7. Thunda Trapped; 8. Mission of Evil; 9. Menace of the Magnetic Rocks; 10. Lair of the Leopard; 11. An Ally from the Sky; 12. Riding Wild; 13. Red Raiders; 14. Savage Vengeance; 15. Judgement of the Jungle.