While reading Final Crisis #5, I noticed that one panel shows a Green Lantern who looks remarkably like the villain Doomsday. He has orange skin instead of grey, but otherwise they look fairly identical. Given that Doomsday is a unique creation and not a race of beings... how is this possible? As far as I can tell, he only shows up in that one panel.
Can someone identify the creature in the panel below, as well as his relationship (if any) with Doomsday?