Superman Unlimited #5

Into the maw of the beast! When the Kryptonite Kingdom is hit by a deadly terror attack from the Cult of Cobra, this looks like a job for every hero except Superman. The nation-state of El Caldero holds the highest concentration of Kryptonite on the planet — literally the last place on Earth Superman should go. But when people cry out for help, the Man of Steel answers. Because he's Superman.

Part one of the first multi-part adventure in Superman Unlimited.