'Grimm' Season 4 Finale News, Spoilers: Nick, Hank, Monroe and Trubel Get Interrupted by A Familiar Face

A big showdown is expected to happen in the fourth season finale of the hit supernatural TV drama series "Grimm" and according to spoiler reports, one familiar face will be joining the Wesen hunters in their mission to take down the Royals.

A sneak peek for the upcoming season ender segment titled "Cry Havoc" is shared by Zap2It and it featured Nick (David Giuntoli), Hank (Russell Hornsby), Monroe (Silas Weir Mitchell) and Trubel (Jacqueline Toboni) heading their way to the Royal lair.

However, the group came to a halt when a car pulled behind them. They positioned themselves to see who the driver is and it turns out to be someone they know. Sergeant Wu (Reggie Lee), with his big shot gun over the shoulders told Nick that he heard about Kelly's brutal murder and it earned him the right to join the hunting party.

"Just so you know, I left my badge at home," Wu told the group.

Nick then instructed everyone to keep the operation as quiet as possible. This prompted them to choose melee weapons with the exception on Nick's crossbow.

"Should I still bring a shotgun ... just in case?" Wu asks for approval.

"You never know," Hank responds.

The episode's synopsis posted on Dread Central meanwhile reads:

"On the heels of a shocking discovery, Nick (David Giuntoli) is hell bent on getting revenge and taking the fight to the Royals with help from Trubel (guest star Jacqueline Toboni). Meanwhile, Juliette's (Bitsie Tulloch) alliance continues to lead her down a dark path."