When Dr. Alec Holland becomes the victim of deadly sabotage and is left for dead, he is transformed by the swamp and the chemicals meant to kill him into a creature struggling with the balance between his own vengeance and the protection of those who can't protect themselves.
A recent storm in the swamp uncovers a car wreck from ten years ago,including the married couples ghosts that think only hours have passed.
A young loner who believes he is a vampire is accused of murdering his mother's boyfriend.
After seemingly having no interest for so many episodes what happened to Jim, Tressa is suddenly in Peru and sidetracked by a voice from her past on a radio.
Return to those thrilling days of the old west in guilt ridden dreams, when Arcane is allowed to hunt a man with the full knowledge of the sheriff.
What happens the swamp itself is no longer an ally to Swamp Thing? The answers lay with a man called Mephisto.
Archane has created a poison engineered to specifically target Swamp Thing's genetic code. Ann has discovered a method of temporarily changing Alec back to human form.
Encountering two men already dead in the swamp is nothing particularly new for Will, but the fact they are from the civil war era is. Can Will solve this mystery of the swamp and find peace for two soldiers?
Arcane finally resurrects his dead wife only to discover he's been duped by Sunderland. The body he's been lording over really belongs to a stripper named Kitty. Which sends Arcane on a rampage of revenge, that turns bitter sweet when he finds his true wife.
Arcane's genius mentor, Carl Mirador, has died. Using an experimental brain cell transfer, Arcane transfers all of Mirador's knowledge into his own brain. This does not go well as Mirador physically takes over Arcane’s mind and body. Meanwhile, Will meets and falls for Mirador’s granddaughter, Dana.
Arcane's rival, Carla Jeffries (Tyne Daly) takes over his business. Swamp Thing discovers that she's a much more formidable enemy than Arcane ever was. Will he, Arcane and Graham put their differences aside to oust Carla?
Swamp Thing is wounded and being tracked down by mercenaries hired by Arcane. He makes his way to Dr. Ann Fisk's lab and is transformed back into Alec Holland. Afterward he is still wounded and aided by Tressa Kipp who finally learns the truth about Swamp Thing.
A wealthy hunter stalks and wounds a rare hawk for a trophy. Afterward the swamp takes Will into it's confidence and Will sees the swamp as he never has before.
The body of a dead man leads Swamp Thing to Archane and Gen. Sunderland.
A chemical plant causing toxic damage to the swamp is the key to a darker future.
Three convicts escape from prison in search of loot from a Las Vegas heist buried in the swamp. One by one they learn the justice of the swamp.
Two young co-eds looking to perform a magic ceremony called the test of Shabalba that will grant them three wishes use Will as a reluctant guide.
Can Swamp Thing save his friend Will from charges of a murder is didn't commit versus the ambitions of a corrupt District Attorney?
When an elderly woman, named Irma Swanson, who knew and befriended Swamp Thing, dies, her estranged daughter, Cathy, comes to town for her funeral. Swamp Thing and the spirit of Irma then show Cathy the past of Irma’s troubled life in order for Cathy to make amends meet.
When a stranger comes to swamp with evil designs of his own upon Swamp Thing's blood, Archane becomes involved.
Will becomes involved with a couple who hold a map that Archane has a keene interest in obtaining.
When the swamp stalks Archane in the form of a panther, an ecological message is the overtone about unsafe modes of power encroaching on nature and how she strikes back. Leaving a forboding and chilling message when even Swamp Thing is powerless.
Swamp Thing gets addicted to hallucinogenic iguana eggs which makes him live out a fantasy with Ann. But the effect causes bad luck with Will when he comes into contact with one of them and ends up a prisoner in Arcane’s lab who is determined to find the nest of rare eggs himself for personal use.
Oliver Duncan awaits death in a hospital while Archane plots to gain his former teachers secrets.