Batman / Superman Vol. 2 #15

Solomon Grundy died on a Sunday! But when this monster man kicks the bucket, all hell breaks loose! When the body of Grundy begins to break down, so begins a toxic time bomb that could wipe out half of North America! It's up to the Man of Steel and the Dark Knight to get Grundy from S.T.A.R. Labs to Slaughter Swamp before the clock hits zero...but with a horde of super-villains all looking to snag the sizzling super-titan for their own nefarious ends, our heroes had better move quickly!