The 12-episode Universal serial Jungle Jim was based on the Alex Raymond comic strip of the same name. Grant Withers stars as Jungle Jim, who on this occasion is leading an expedition into darkest Africa. His employers hope to ascertain the whereabouts of Joan (Betty Jane Rhodes), a young heiress who disappeared in the jungle several years earlier. It turns out that Joan has become the ruler of a small native tribe -- and that she has fallen under the influence of The Cobra (Henry Brandon), a mysterious figure who exercises an evil influence upon her. With Jungle Jim's help, Joan breaks free of The Cobra's spell; now, however, both hero and heroine must make their way back to civilization without being devoured by marauding wildlife. Though Jungle Jim was well received, it would be another 12 years before Columbia's Jungle Jim "B"-movie series began production.