Autumn pays the price for the deal that spared her husband's life.
Autumn is the nurse seen in episode 3, "Robot Lovestory". We learn here that she is Specim3n's wife, and made a deal to save his life -- which brought him into the Dark Doctor's laboratory/hospital. Having helped Specim3n escape, Autumn retreats home, but is found by the Dark Doctor, who reminds her of the deal she made for her husband's life, seizing control of her body in a dance-world parallel to the puppetmaster villain (Eric Doyle) seen in the show Heroes. This establishes another pair of opposite-side characters, with Justin Starr and Jimmy Angel already looking to fall on opposing sides of the Uprising vs. LXD conflict.