Greg Pitts

When a human skeleton is discovered in the trenches of an old Civil War battleground, Brennan and Booth are called to the case. Despite the historical location, Brennan quickly identifies the bones as belonging to Dan Pinard, a present-day local dentist. While Booth investigates suspects, including the victim’s former boyfriend, Hodgins and lab intern Vincent Nigel-Murray (guest star Cartwright) work doggedly to clean the bones of a stubborn clay residue which is preventing the team from determining a cause of death. Meanwhile, Booth’s brother, Jared, (guest star Fehr) returns from his travels with some suprising news.

The Thanksgiving holiday is more difficult for the interns and residents than any of them is willing to admit, as Izzie plans a big dinner at Meredith's -- but it remains to be seen who among the invited guests will actually show up. Meanwhile, George endures the O'Malley tradition of hunting turkeys with his less-than-sophisticated family, and Meredith treats a patient who's been in a vegetative state for 16 years.

The O'Malley Family visits George at the hospital, Meredith is determined to have a more positive outlook on life, Derek and Addison strive for a civil relationship, and Richard endeavors to reunite with his wife, Adele.

Mike must decide which way he will vote when the all-male Outdoor Man's softball team gets a mandate to allow females to play. Also, while helping a reluctant Mandy fill out college applications, Kristin makes some decisions about her own future. Mike hopes Mandy will go to his alma mater of Michigan State, but Vanessa wants her to attend her alma mater, the rival Ohio State.

Mike feels let down when his daughters aren't into celebrating Halloween with him the way they used to. He decides that his two-year-old grandson, Boyd, can be his perfect trick or treat partner. But Kristin, Boyd's mother, adamantly tells him that she doesn't want her son to go out on Halloween. Mike sneaks him out -- with a plan to get the child home before Kristin gets back from work. When Mike, dressed as John Wayne from "The Green Berets," gets to Ed's house with Boyd, they are greeted at the door by Ed's lady friend, Elvira (guest star Cassandra Peterson).