In Superman/Batman: Mash-Up, Doctor Destiny traps Batman and Superman in a dream world home to the Justice Titans—the Justice League and Teen Titans merged into one.
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  This event or storyline is specifically related to Superman, or to members of the Superman Family. This template will automatically categorize articles that include it into the Superman Storylines category. |
 This event or storyline is specifically related to Batman, or to members of the Batman Family. This template will automatically categorize articles that include it into the Batman Storylines category. |