In the 853rd century, Earth remains safe, thanks to the heroics of the JLA of the future. The ancestors of Batman, Superman, Wonder Woman, The Flash, and others remain united in combating forces of evil, but perhaps have never met anything as deadly as the sentient supercomputer Solaris, the Tyrant Sun. As this villainous threat becomes too much to handle, these heroes of the future turn to the only group they know can help: the original JLA.