"Grey's Anatomy" wraps up this season with a two-hour finale, airing tonight  starting at 9 p.m. on ABC, involving a really big trauma case requiring several of the surgeons, including Dr. Erica Hahn (BROOKE SMITH), to work on freeing a boy from a hardening block of cement.

ET is with Brooke to get all the inside scoop on the "Grey's" drama, including the lesbian kiss with Callie (SARA RAMIREZ). Will that turn into a romance, or was it just to get McSteamy's (ERIC DANE) goat?

Also on tonight's episode: Meredith (ELLEN POMPEO) and Derek (PATRICK DEMPSEY) attempt to save the last patient in their clinical trial involving brain tumors. Izzie (KATHERINE HEIGL) helps Alex (JUSTIN CHAMBERS) care for Rebecca (ELIZABETH REASER), and Lexie (CHYLER LEIGH) uncovers crucial information about George's (T.R. KNIGHT) internship.