The JLA and JSA, alongside the Legion are captured by Mordru in the 30th century and forced to do his task- To reclaim the three items lost after the JLA satellite was destroyed in the late 20th century: Bell, Wheel, and Jar, so the three demons the JLA have fought before on Earth-1: Abnegazar, Rath, and Ghast, are restored, so they can do Mordru's biddings.