Swamp Thing - Secret At The Heart Of Swamp Thing - The CW - About SWAMP THING: From DC, SWAMP THING follows Dr. Abby Arcane (Crystal Reed, "Gotham," "Teen Wolf") as she investigates what seems to be a deadly swamp-born virus in a small town in Louisiana. But when a mysterious creature emerges from the murky marsh, she finds herself facing the nightmares of a supernatural world where no one is safe.