A mermaid-like Wesen with gill slits and webbed limbs that can only survive out of water for a limited time.
Nick suspects a Wesen link when a priest is brutally murdered during an exorcism.
Russell talks about Santa's alter ego who takes cae of the kids that have been naughty.
Juliette takes a risk to kill off Daniel's parasite.
Nick tells a young lady what she really is.
Nick investigates a vicious slaying at a boxing gym while dealing with repercussions from a strange vision. Elsewhere, Monroe and Rosalee make some headway in their quest to help Nick regain his powers and Adalind gets an unusual visitor.
Nick and Monroe come under attack from a gang of ruthless, bloodthirsty Wildesheer.
The Lebensauger is a leech-like Wesen who coerces its victims through fear and intimidation, then sucks the blood from their bodies.
The third season ends with the arrival of Monroe and Rosalee's wedding day. Meanwhile, Nick and Juliette come to a surprising realization that could have lasting effects on their relationship and Adalind's actions have disastrous consequences.
Wu talks to Hank about what he saw and read in Nick's book.
Monroe feels like something needs to be said.
While Nick's attention is focused on a likely suspect at the station, the real El Cucuy strikes again.
David Giuntoli, Silas Weir Mitchell, Russell Hornsby and Claire Coffee hint at what's to come in Grimm's fourth season.
Monroe and Rosalee remember that Captain Renard is a Zauberbiest, while searching for a cure for Nick.
The actress takes fans behind the scenes at Rosalee's Spice Shop and Nick and Juliette's house.
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