Metropolis
The problems of Metropolis. Metropolis is a silent dystopian sci-fi film from 1927. In DC Comics' All-Star Squadron, Roy Thomas revealed the Metropolis took place in the future 23rd century of Earth-2. Rotwang was Luthor's descendant and the robot that replaced Maria became known as Mekanique. Following the events of the film, Mekanique was given the abilities to time travel, and apparently even greater powers of time and space. In the final issues of All-Star Squadron, which tied into Crisis on Infinite Earths, Mekanique arrived in 1942 to save a little girl from being hit by a car, because that will ensure Rotwang's future Metropolis timeline. But then, it's revealed that the Crisis had ended, which means that Earth-2 should have ceased to exist, replaced by the new post-Crisis universe. Mekanique had been holding back the effects of the Crisis from affecting April 1942 on Earth-2 until her mission was complete, but once she ensures her future, she the...