If we’ve learned anything from Animal Man and Swamp Thing it’s that you can’t have one without the other, or The Rot. So with the knowledge that Green Lantern is the warrior of the Green on Earth 2 we also see our first villain rise up in response.
Death spreads across the ground as things wither and die, The Rot spreads calling itself The Grey. Up rises the Man of Grey, looking to challenge the Green Lantern.
The Man of Grey is Grundy.