Daniel Cassidy is shown a vision by the Phantom Stranger of Abby and Liz being killed. To save them, he finally embraces his destiny, transforming into the Blue Devil and slaughtering the Conclave guards.
The episode centers on a horrific, live dissection of Swamp Thing by . Woodrue makes a world-shattering discovery: The Mimicry: Swamp Thing is not Alec Holland. [S1E9] The Anatomy Lesson
The episode is noted for its "noirish" aesthetic and gruesome special effects during the autopsy scene. Daniel Cassidy is shown a vision by the