|Season 1, Episode 20|
|Airdate||January 7, 2007|
|Writers|| Mary Crawford|
Dark Descent is the twentieth episode of the first season.
The Defenders discover the Machine of Binding, and Erik devises a plan to re-wire the machine to enable it to draw the Pure Stones to it. Their plan is foiled by an attack from Flinch and as Erik lies gravely ill, and meanwhile a strange metamorphosis is taking place within Seth. It is a change that will affect Seth both physically and psychologically and which may affect the outcome of their mission.