David Giuntoli David Giuntoli

Aunt Marie's trailer strikes again!

On Friday's all-new Grimm (9/8c, NBC), Nick (David Giuntoli) and his pals turn to Aunt Marie's trailer for help researching a Wesen known as a Koschie.

Winter TV: Must-see new shows

They delve into the files for World War I and uncover a surprising secret about one historical figure. Check out this exclusive sneak peek of "Red Menace" below:

Grimm airs Friday at 9/8c on NBC.