J'onn got enhanced with some sort of alien blood magic and survived an apocalypse if I remember correctly. That was a solid book with great art, wish it had went on a little longer. Doubt that storyline is still in use though with the direction they seem to have for him lol
And I can't wait for him and M'gann to link up in the annual, they've always had a close relationship but we don't see them together often.