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.
Dr. Arcane meets Swamp Thing again, face to face. Avery is struggling to maintain control, financially and personally.