In the Sixth Dimension, the league are given a guided tour of the utopian world that has been created by their future selves, after their victory over Perpetua and the Legion of Doom.
But when the son of the future versions of Hawkgirl and Martian Manhunter decides to secretly reveal the truth behind the lies, that it become clear this place and these people are not what they appear.
Back in the present day, Mera and Starman try and break Mr. Mxyzptlk free from the Legion’s control but he grows into a huge rampaging creature. Monitoring the situation, Luthor asks Brainiac to think of the possibilities if they had their own Imp with such vast powers.
Meanwhile, in the cold, dark void where the real Superman continues to vainly try and break free, he finally is confronted by his doppelganger.