Garth leaves back to the 31st Century with Karate Kid and Una's bodies, but not before giving Superman a new flight ring and giving Batman a veiled warning about upcoming struggles.
In "Batman R.I.P.", a past hallucination induced by Professor Milo's gas is revealed to have inspired Bruce Wayne to create the 'back-up' personality of the Batman of Zurr-Enn-Arrh, a more ruthless Batman personality designed to take over in the event of Bruce Wayne being psychologically attacked in such a manner as to render Batman out of action.
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