In 2056, Bart and Nathaniel Tryon worked on a way to change the dystopia that they were in. They believed the cause for the apocalyptic event that made their time inhospitable started with the death of The Flash, so Bart would travel back in time to stop it. Tryon, who as Neutron had been responsible for many past atrocities, gave Bart a special device that would strip Neutron of his powers. He also warned him that the time machine would break after using it once.