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Sam gets notified of the death at Ellie’s apartment, so they go to the scene. As Ellie waits in the police cruiser, the son, [[Christoph Nauhaus]], opens her door and handcuffs her. He takes off with Ellie as Sam and Dean exit the building. They see Ellie and follow. Christoph drives to a parking garage to switch vehicles, but he can’t find the keys. He calls his father, and the two argue. Distracted, Christoph doesn’t notice Dean has a gun on him. Sam rescues Ellie.
In an abandoned office in the garage, the Winchesters tie Christoph to a chair and attempt to explain the situation to Ellie. Christoph refuses to answer questions and taunts Dean to kill him. Dean motions for Sam to cover Ellie as he prepares to shoot Christoph. Sam shields Ellie as Dean takes aim. Christoph immediately agrees to talk. According to Christoph, the pocket watch dates back to World War II. It belongs to his father, [[Commandant
Nauhuas]], a Thule High Command. At the end of the war, when Hitler was preparing to shoot himself, Nauhaus stopped him, telling him of "another way". Nauhaus preserved [[Hitler]]’s [[soul]] inside the [[Nazi Pocket Watch|watch]], which has been missing since the end of the war. With its rediscovery, the Thule plan to resurrect Hitler. Christoph says the soul of Hitler can only possess a direct descendant. Christoph nods to Ellie as one such descendant. Ellie insists her mother traced their genealogy to the Mayflower, but Christoph tells her she’s adopted. He explains they’ve been watching her. To prove it, he recites details about her life. As the details get more specific, she storms off.
Sam follows Ellie and learns that she'd called home and her mother confirmed Christoph’s claim. Ellie launches into a tearful tirade. In the other room, Christoph attempts small talk with Dean, and outside the office a limousine enters the parking garage with Nauhuas inside, clutching the cloth with Ellie's blood. Sam comforts Ellie, saying he understands her situation. He admits he was meant to bring back Lucifer. Ellie decides she doesn’t believe anything they’ve said and stands to leave. Dean comes in and tells her this is a great chance to destroy the Thule, a time to stand and fight. As they talk, the Thule enter the offices. The brothers leave Ellie hidden and fight the Thule. Neither Winchester is doing well when the Thule receive a message on their earpieces and leave abruptly.
At the diner, the brothers are discussing Ellie when Christoph sits next to Sam. Dean trains a gun on him. Christoph offers to help find Ellie in exchange for protection. To prove his trustworthiness, Christoph tells them a Thule is watching, and that he killed one after his father ordered his execution. The Winchesters let Christoph lead them to Ellie.
Outside the hangar, Nauhaus stands over Fritz’s body, expressing admiration that his son displayed such courage. The Thule wheel Ellie towards medical equipment. The Impala parks near the hangar and Sam handcuffs Christoph to the Impala. The brothers load up from the Impala’s arsenal, and Dean grabs the [[
grenade launcher]]. Sam nixes the idea, to his brother's intense disappointment. Inside the hangar, the ritual begins; a tube leads from Ellie to a medical device, and then to Nauhaus, the recipient of her blood. Outside, Sam and Dean take down the guards and enter.
The Thule place the watch on Nauhuas’s torso. It creates a swastika-shaped incision and sinks into his chest. The incision cauterizes instantly, leaving a swastika-shaped scar. Nauhaus springs to life with maniacal laughter. Hitler, in Nauhaus’s body, exuberantly jumps up and down. He recognizes Hans, Wolfgang, and Gottfried, greeting them enthusiastically. Hitler notices Ellie, calling her his great great grand-niece. He thanks her, but he tells his men to drain her blood and feed her to the dogs. Sam and Dean enter the building, are captured, and delivered to Hitler. Dean calls Nauhaus father of the year, and Gottfried demands he address the Fuhrer with respect. The Winchesters realize Hitler is possessing Nauhaus.