Swamp Thing is learning he can regrow himself. Meanwhile, the mysterious John Constantine arrives from London to find out more about something on it's way to Earth. Some say it's a massive extra-galactic energy field that got drawn inside a black hole eight billion years ago, others say it's Cthulu, and still others say it's Satan himself. Constantine goes to Louisiana to meet with Swamp Thing and tells him he is the only plant elemental left on Earth. Somehow Constantine knows all about Swamp Thing and what he is. Back in New York City, one of John Constantine's friends encounters a demon called Invunche, causing people in various parts of the world to have psychic reactions.