Superman and Batman: My Friend, My Enemy, Myself
by Libbylawrence 
When Jimmy Olsen learns that an unknown foe has executed a scheme to cause Superman and Batman to kill each other, he dons his old Flamebird identity and enlists the help of his old pal Nightwing (the former Robin) to save the World’s Finest Heroes! Can the new Nightwing-Flamebird team warn Superman and Batman in time without tipping off their foe?
Justice League of America: World’s Fiercest
by HarveyKent 
Could it be true? Have Superman, Batman, and Nightwing really turned evil? The Justice League of America swears to learn the truth, or perish trying! But even if the Justice League triumphs over their friends turned foes, will the public ever be able to trust super-heroes again? Guest starring the New Titans!