The Return of Chandu
Chandu consults his crystal ball and sees that Nadji, Princess of Egypt, is in danger. She is about to be sacrificed by the black magic cult of Ubasti. Headed for the magic island of Lemuria, he is shipwrecked , washed ashore and captured. He becomes invisible, escapes and after numerous detours is able to rescue the princess.
Bela Lugosi as a hero in this 12-part (2 feature) serial! It's done by a independent company so not that great, but they do get to borrow sets from the big studios including using the big gate in "King Kong (1933)" and does have some fancy costumes, so it's far from the worst attempt at a adventure story.
"The Return of Chandu" is a two story serial made so they could slice it up and sell it as 2 feature films for those that didn't want the twelve 17-minute episodes version. To cause some confusion they called the first movie "The Return of Chandu", yeah, the same name, which uses the first 4 episodes and "Chandu on the Magic Island"…