The Lost Jungle (1934) is a Mascot Picturesmovie serial. A semi-sequel to this serial, Darkest Africa, was released by Republic Pictures in 1936. Republic was made from a merger of several companies, including Mascot, which became the B-Western and serial production arm of the company, as well as providing them with a studio.
In an unusual move, a feature film version was made simultaneously with the serial by re-filming several principal scenes with different dialog, and several other principal scenes altogether new, particularly the ending, thereby creating an essentially new and different story.