Nick's mother goes head to head with Catherine, and the battle with Mauvais Dentes continues.
Nick's mother (guest star Mary Elizabeth Mastrantonio) will show what she's willing to do to protect her son in the next episode of "Grimm". As Catherine learns that Kelly is Nick's mother, the Hexenbiest quickly jumps to attack Kelly and the two ladies are involved in a fight.
In another point of the episode, Nick and his mother continue to battle the Mauvais Dentes (guest star Mike Dopud) with Mrs. Burkhardt questioning who sends the Bad Teeth. Meanwhile, Monroe and Rosalee race against the clock to save Juliette who is still in coma.
Also in "The Kiss" that will air Monday, August 20 at 10 P.M. ET on NBC, more details will be revealed about the source of Juliette's illness, resulting in an epic showdown. Back at the precinct, Hank senses that something is amiss when Nick lands in hot water with the FBI. Meanwhile, Captain Renard continues to reveal himself as he deals with his estranged brother (guest star James Frain).