Martian Manhunter guest stars as "American Tidal" continues! Thousands are trapped beneath the ruins of San Diego, scared and starving — but somehow able to breathe underwater! It's up to Aquaman to dig them out of the wreckage with the aid of Martian Manhunter. Meanwhile, San Diego survivor Lorena Marquez wakes up in JLA HQ, wondering how she wound up on the moon!