The BAU team heads to Yakima, Wash., after the remains of a dozen people are found along a creek bed. Also, they welcome new team member Stephen Walker (Damon Gupton), a seasoned profiler from the Behavioral Analysis Program of the FBI, in "Scarecrow" on Wednesday, Dec. 7 at 9/8c on CBS and CBS All Access.

Watch Criminal Minds on CBS and CBS All Access.