You Don't Know Jack (Grimm)

"**You Don't Know Jack**"
"You Don't Know Jack"
Grimm episode
Episode no.	Season 4; Episode 20
Directed by	Terrence O'Hara
Written by	Sean Calder; Michael Golamco
Featured music	Richard Marvin
Editing by	Scott Boyd
Production code	420
Original air date	May 1, 2015
Running time	42 minutes
Guest appearances
	Nico Evers-Swindell as Kenneth Alun Goderich Bowes-Lyon; Garcelle Beauvais as Henrietta; Danny Bruno as Bud Wurstner;
Episode chronology
← Previous; "Iron Hans"	Next →; "Headache"
	Grimm season 4
	List of episodes

"You Don't Know Jack" is the 20th episode of season 4 of the supernatural drama television series Grimm and the 86th episode overall, which premiered on May 1, 2015, on the broadcast network NBC. The episode was written by Sean Calder and Michael Golamco and was directed by Terrence O'Hara.