Swamp Thing - The Cast Featurette - The CWbr br About SWAMP THING:br 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.