BATMAN/SUPERMAN: WORLD'S FINEST VOL. 2: STRANGE VISITOR
Batman and Superman are on a quest to train the mysterious new hero Boy Thunder…but what’s that in the dark? A faint noise. Sounds like a laugh? Uh-oh…the Joker is here, and he’s got his own plans for a super-powered sidekick! Someone hide all the crowbars, quick!
Collecting Batman/Superman: World’s Finest #6-10.