'Grimm': What's Happening In The Season 2 Finale?

David Giuntoli, Bree Turner and Silas Weir Mitchell chat with AccessHollywood.com's Laura Saltman about "Grimm" moving to Tuesday nights after "The Voice." Also, the trio gives a cute and quick explanation of the NBC series for people who are new to the show. Plus, what can fans expect to see in the season finale?