Sam tries to release Dean from the Mark of Cain. Meanwhile, Crowley seeks the help of an unlikely ally after encountering problems due to Dean's behavior.
The victim: Barb Birk; the killer: Sasha King
Barb was the owner of her own diner, in whose kitchen her charred remains were found. Sasha in an ex-employee of Barb and currently lives and works at a women's shelter. The fire was started in the early morning on a day that the diner was closed. Suspicion initially falls on the victim's son, Jason Birk, whose lighter was used to start the fire.
The murder of a scientist working on developing a source of clean energy forces Keira to make a difficult choice - do the right thing or preserve the future. Meanwhile, Edouard Kagame arrives in 2012 and Kiera and Carlos are determined to find him before Liber8.moreless
While David Robert Jones goes after his next target, Walter visits the Other Side to help the team's counterparts with an investigation into a Fringe case that touches on both worlds.
While Olivia and Lincoln try to return Peter home, they try to cope with the looming threat of the transparent shapeshifters. Meanwhile, a traitor is revealed and an old enemy emerges from the shadows.moreless