Silas Weir Mitchell, Bree Turner Silas Weir Mitchell, Bree Turner

"This is the beaver section. Fuchsbau here..."

The placement of Wesen is of utmost importance on this sunny April day in Portland on the set of Grimm. But it's not to keep predator and prey apart; instead it's to differentiate between who's there for the bride and who's there for the groom. Welcome to the wedding of the fox-like Fuchsbau Rosalee (Bree Turner) and wolfy Blutbad Monroe (Silas Weir Mitchell) for the series' Season 3 finale Friday (9/8c, NBC).

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The "Father" of the Bride

"I have the honor and responsibility of giving away Rosalee," Russell Hornsby, who plays Nick's Portland PD partner Hank, says. "She's without a father, so I've been blessed with the responsibility of walking her down the aisle." Turner adds, "I don't really have any male figures in my life, and Hank has been a friend, a confidante, a supporter. I think it's also furthering the unification of Kehrseites and Wesen, and that we're really standing as a couple above this brave new world of mixing everyone together."

The Party Pooper
Although Adalind is not invited to the wedding (as if!), her influence will be far-reaching. "In light of what has happened in the past, I basically have Adalind repellent. She won't swing back my way ever again," Hornsby says. "She's looking to invade somebody else's space. She's sort of easing her way down the road and making stops in different people's lives. She starts with me and then she goes with Nick and then she comes to me and then goes to the captain and then goes back to Nick and then f---ing with Juliette."

The Wild Card
The new Grimm in town Trubel (Jacqueline Toboni) is "young and she's feisty. She hasn't learned to respect her elders just yet," Hornsby says. She always intends to listen (like when she was told to stay in the car), but bigger issues like saving someone's life always interferes. Like Adalind, she's not invited to the wedding, but one way or another, she just can't seem to avoid trouble.

What do you think will go down at the Grimm wedding? Catch up on the last episode here.

The Grimm finale airs Friday at 9/8c on NBC.