JLA (1996-) #59

The world is rocked as 'Jokerized' villains run rampant. As the worst of these are being rounded up, the Justice League must contend with one of the most threatening attacks yet. Dr. Polaris, under the influence of the Joker, has taken control of the Earth's magnetic axis! With complete madness consuming him, will the already unstable metahuman tip the Earth over just to teach the heroes a lesson?