Solomon Grundy

Justice Society
In the nineteen eighties, Grundy ended up re-encountering his old foe, Alan Scott. They fought once more. Scott quite literally punches Grundy's lights out, leaving him wandering in the walled off abandoned subways below Gotham. 
Grundy would be discovered by Oswald Cobblepot, heir to the disgraced Cobblepot family who had been living in the sewers off Gotham. Appealing to Grundy's loneliness and simple nature, Cobblepot persuaded him to join him. Cobblepot would treat him fairly well but discard him when no longer necessary.
The Crux of Cobblepot's motivation to use Grundy is such. After the wealthy Natalia Nightingale, alias Nocturna, uses her combination of mysterious beauty and wealthy platform. From there, Grundy is Cobblepot's chief of security, as he calls him...
Long Halloween, LOD, TDKR
Batman and Black Bat lead the league