Two different feature versions of this serial were released theatrically in 1935. See The Lost City and The Lost City. One of the feature versions was condensed from the entire serial, the other was condensed from just chapters 1-4 with some added wrap up scenes tacked on. A few years later, yet another feature version of this serial was released theatrically, titled City of Lost Men.
Racing to complete his serial before Mascot finished The Phantom Empire, producer Sherman S. Krellberg used three production units, thereby slicing production time from the scheduled 35 days to 21.