Improve. Adapt. Overcome. The same lessons John Stewart learned in the Marine Corps help him begin his quest to find the other lost Lanterns in the dark sectors of space. Meanwhile* back on Oa* one of the Corps' newest members* Jo Mullein* alongside Young Justice's Teen Lantern and Simon Baz* tends to the wounded and investigates who or what caused the source of all Green Lanterns' power to go nuclear and wipe out the Corps.