In 2001, Polaris emerges during the Joker 's " Last Laugh " crisis attempting to take control of the magnetic south pole itself, forcing a battle against the Justice League where the League only just manage to defeat him thanks to the actions of Plastic Man (the only League member with no metal on him whatsoever). At the end of Last Laugh, the Slab metahuman prison is moved to Antarctica, as Polaris now is the magnetic pole and cannot be moved.