A trail of homicides puts Nick and Hank in pursuit of a deadly heartbreaker; Nick's rising stature in the creature world prompts concerns about Juliette's safety

Nick finds a black market that supplies the creature world with human organs; Nick and Juliette befriend a pair of homeless siblings whose friends have vanished.

A gruesome homicide may be linked to a man's troubling childhood; Monroe receives a disturbing message from the creature community.

A prison escapee seeks revenge against those who put him behind bars, and his strength and high tolerance for pain makes Nick suspect the fugitive is a monste

A murder investigation in the woods leads to the reopening of a missing-person case; Nick asks Monroe to make contact with a feral creature

An arson case exposes a family feud; Monroe confronts people from his troubled past.

A high school teacher's death kicks off an investigation that leads Nick to a troubled, young, musical prodigy

Monroe goes undercover to get a whiff of a hypnotic suspect for Nick; a stranger seeks revenge for the death of a friend who was killed by a Grimm

An innocent flash-mob scene ends with a homicide; Nick learns more about his roots; Hank and Nick are tasked with protecting a shady character

Nick and Hank investigate a breaking-and-entering case that leads them to a mysterious family with a cultural heritage of blurring the line between right and wrong; Nick asks Monroe to safeguard Aunt Marie.

A university student is savagely attacked while jogging, and a mysterious woman visits her nephew to tell him a family secret in the opener of the dramatic series following a detective who tracks fairy-tale monsters.