Grimm is a drama series inspired by the classic Grimm Brothers' Fairy Tales. After Portland homicide detective Nick Burkhardt discovers he's descended from an elite line of criminal profilers known as "Grimms", he increasingly finds his responsibilities as a detective at odds with his new responsibilities as a Grimm.
With pressure coming down from Black Claw, Renard claims that Nick killed Conrad and gives his officers a shoot-to-kill order on the Grimm. Meanwhile, Eve discovers that she can't woge, and Monroe and Rosalee consider their baby's future.
Back at work, Nick, Hank and Wu investigate a baby abduction tied to an ancient Wesen legend of El Cuegle, which steals and eats babies. Meanwhile, Adalind takes Diana to stay with Renard, while Eve examines the stick.
A cicada-like Wesen emerges from its seven-year hibernation with an insatiable hunger... and a need to find a victim that will sustain it through its next hibernation. Meanwhile, Adalind finds Eve in the tunnels, and Monroe and Rosalee confirm Diana's predictions about Rosalee's pregnancy.
After a hotel guest kills a man on the street, Nick and Hank investigate and discover a series of bizarre murders and suicides at the same hotel. Meanwhile, Eve and Rosalee try to work out the meaning of the symbols,and Renard gets a warning about a visitor.
When a scientist is killed in her laboratory, Hank and Wu investigate and discover that a strange incident ties together the dead woman with three of her colleagues. Meanwhile, the black-skulled creature attacks Eve, and Nick stands guard over her as she recovers in the hospital.
Nick and the others investigate a series of disappearances in the forest all tied to crimes against nature. Meanwhile, Diana tells the group where the creature that attacked Eve came from, and Renard gets disturbing news from his contact in Russia.
Nick and Hank investigate two seemingly unrelated crimes: a mystery killer of people on the street, and an orderly who claims that an elderly patient turned into a monster and attacked him shortly before she turned up dead.
Nick use the Stick to pass through the mirror, but discovers that he and Eve are trapped on the other side. Meanwhile, the others bring Renard in and Dasha warns them that they are facing the fulfillment of ancient prophecy.
The prophecy that was uncovered comes to pass when a dark force arrives in Portland with its eyes set on Diana. In an effort to protect her, Nick, along with Capt. Renard and Adalind, returns to the scene of his first investigation as a Grimm. Back at the Spice Shop, Monroe, Eve and Rosalee make a discovery that uncovers the origins of the mysterious stick. Meanwhile, Hank and Wu are called to a crime scene that is connected to the gang's greatest threat.
Nick faces off against his greatest foe yet as it seems no weapon can defeat him. At the Spice Shop, Monroe, Rosalee and Eve search for answers and stumble upon a rare potion that may help the fight. Elsewhere, Capt. Renard and Adalind try to keep Diana and baby Kelly safe as the threat has its eyes set on the children.