Juliette, Monroe y Rosalee, presas del pánico, solicitan la ayuda de Hank para defenderse de una horda de zombis mientras intentan descubrir qué le pasó a Nick. Sabiendo la verdad, el Capitán Renard toma medidas para ayudar a rescatar a Nick de las garras de su hermano Eric. En otra parte, junto con la ayuda de la misteriosa Stefania, Adalind se enfrenta a su tarea más espantosa hasta el momento en su esfuerzo por recuperar sus habilidades Hexenbiest.

Monroe, Hank, Rosalee y Juliette rastrean a un Nick maníaco y hacen todo lo posible para encontrarlo y revertir lo que le han hecho antes de que cause más daño. Mientras tanto, el Capitán Renard hace todo lo posible para limpiar las consecuencias zombies en todos los frentes: nacional e internacional. En otros lugares, cuanto más tiempo pasa Adalind con Stefania, más inquietantes parecen ponerse las cosas en su búsqueda por recuperar sus habilidades Hexenbiest.

Cuando Nick y Hank investigan una muerte por ahogamiento con marcas misteriosas en los tobillos de la víctima, se topan con un grupo de Wesen atrapados en el agua con un abrazo poscoital mortal. Mientras tanto, Rosalee comienza a desempacar sus cosas en Monroe's y el Capitán Renard se da cuenta sorprendentemente de las posibles identidades de los padres del Bebé Real.

Nick and Hank are on the case as repeat instances of apparent vigilantism have whispers of an old Spanish legend making their way through a working-class Portland neighborhood. Elsewhere, Juliette learns the truth about Nick’s mother. Meanwhile, Adalind has a brief scare during her ultrasound.

Nick enfrenta su desafío más difícil hasta el momento cuando él y Hank investigan un caso que combina un fenómeno religioso con los oscuros tratos del Consejo Wesen. Mientras tanto, Rosalee se siente desgarrada cuando el caso de Nick pone en duda su lealtad a los Wesen. En otra parte, el Capitán Renard deja la ciudad para atender algunos "asuntos familiares".

Mientras una ola de crímenes mortales comienza a surgir, una leyenda urbana centenaria toma forma en las alcantarillas de Portland y se convierte en el último caso de Nick. En Europa, Adalind conoce al Príncipe Viktor, quien ha venido para llevar ante la justicia a los responsables de la muerte de su primo Eric. Mientras tanto, el Capitán Renard responde al reciente atentado contra su vida.

Después de que una serie de adolescentes delincuentes desaparecen, un viejo cuento wesen sobre un Papá Noel malvado que trae algo más que un trozo de carbón puede ser el principal sospechoso. La investigación se intensifica cuando Nick y Hank llevan las cosas demasiado lejos. Mientras tanto, Monroe recluta a Juliet para sorprender a Rosalee en su primera Navidad, pero obtiene resultados no deseados. Por otra parte, la gira del Capitán Renard por Europa lo acerca a localizar a Adalind.

Nick y Hank investigan a un "sanador" Wesen cuya habilidad conlleva riesgos que superan con creces sus recompensas. Mientras tanto, Juliette acoge a una amiga cuando los problemas domésticos se intensifican y Hank intenta contratar a su fisioterapeuta Zuri. En otra parte, el Capitán Renard finalmente localiza a Adalind y le hace una severa advertencia.

Nick and Hank are called to the scene of a gang-related homicide. The case escalates as Zuri, Hank’s physical therapist, and her brother get caught up in the investigation. Meanwhile, Juliette seeks advice from Rosalee in dealing with the news that her friend is Wesen.

Nick and Hank are called to the gruesome murder of a veteran working in home security. During their investigation, they discover this might be one of several revenge killings regarding a horrifying cover-up involving members of the army and military contractors. On the domestic front, Monroe accompanies Rosalee during her long overdue reunion with her mother and sister. In Europe, Adalind sees hints of what she thinks might be her powers returning.

Nick and Hank investigate a cop killer who scalps his victims. Meanwhile, Juliette begins to communicate with Nick's mom via email and Adalind finds herself much closer to delivering her baby than she previously thought. Elsewhere, Monroe's parents decide to surprise him and Rosalee with an early arrival to Portland after learning some exciting news.

Monroe fights an impossible battle to convince his parents to embrace the life choices he’s made. Meanwhile, Nick turns to Juliette to help him figure out the Wesen aspect of his cop-killing scalper investigation. On the Royal Baby front, Captain Renard learns new information that forces him to contact Adalind in the interest of keeping her and the baby safe from Viktor.

A horrible new predator creeps into Portland with its sight set on a young expectant couple who are close friends of Sgt. Wu. Nick and Hank must figure out how to deal with Wu as the investigation escalates. Meanwhile, Adalind prepares for a special delivery while her enemies are hot on her trail.

Nick and Hank find themselves thrown into the middle of an ancient battle and things heat up when the Wesen Council decides to get involved. Monroe and Rosalee fill everyone in on early Wesen history. Meanwhile, Sgt. Wu is still reeling from the events he recently experienced. As things heat up in Europe, one of the Resistance’s most trusted allies gets compromised as he tries to protect Adalind.

A double homicide leads Nick and Hank to a traveling carnival where the performers are not what they seem. To get a better understanding of what's going on behind the scenes Monroe and Rosalee go undercover. On the wedding front, Monroe has a really important question for Nick. In Austria, an invaluable member of the Resistance makes the ultimate sacrifice to help Adalind.

The Resistance's plan to keep Adalind safe gets kicked into high gear when an unexpected ally arrives to ensure she and the baby make it out of Europe safely. In Portland, as Monroe and Rosalee prepare for their upcoming wedding, Nick and Juliette are reminded of their failed proposal.

Nick and his mom, Kelly Burkhardt, join forces to protect Adalind's baby. Meanwhile, Prince Viktor activates a deadly stateside asset to find Adalind and her child.

Nick and Hank investigate a dangerous female suspect leaving a trail of Wesen in her wake. Elsewhere, Adalind takes measures into her own hands, even if that means forging a dangerous alliance.

When Nick brings Trubel on a ride along with Hank, they end up investigating the murder of a young woman; Adalind is hopeful after making a discovery.

Nick and Hank learn the victims of the homicide they are investigating were from a special section of the Verrat; Renard grows suspicious of Adalind's behavior.

Rosalee and Monroe's big day arrives; a realization shakes Juliette and Nick's relationship to its core; Adalind's plan leads to a catastrophic event.