The Conclave have come to Marais, to destroy Swamp Thing once and for all.
Woodrue cuts into Swampy while Cassidy accepts his fate as the Blue Devil.
Abby goes back to the CDC, where new trouble arises. Back in Marais, Avery meets Swamp Thing.
Lucilia settles the score with Avery. In the swamp, Abby and Alec run into danger.
Dr. Woodrue does an unsanctioned human experiment, while Dr. Arcane struggles to help Alec.
Swampy meets Phantom Stranger. Abby has to try and help Maria.
Dr. Arcane finds out more about the Green Flu as it spreads further and more dangerously through Marais.